Kannel setup linux serverdela

UX/UI d...once the period is done Toggle features related to the subscription for Backend and Frontend: - Redefining the features for depends on the subscription plan for the Recruiter FE/BE - Redefining the features for depends on the subscription plan for the job seeker FE/BE Integration with payment Gateway (Moneris): - Exploring the payment Gateway - Setup and Configuration (Configure sandbox/test environment for development) - Implement server-side logic for handling payment requests and responses. - Integrate App for payment form submission and validation - Implement error handling and logging mechanisms. Improving UI for Admin and App to be able to view the payment status and logs - Adding a screen to the App to be able to see the current subscription status...

I require a technical expert to set up Laravel 8.83 on an Amazon Web Services (AWS) EC2 and RDS server. I haveve already set up the project (composer install/migrate). I need help resolving some errors and also setting up SSL/domain. - AWS Configuration: You'll be required to efficiently set up and configure an AWS EC2 and RDS server for my Laravel project. - Laravel Installation: Expertise needed in installing and testing Laravel 8.x framework using the project files I provide. A successful freelancer for this project should have: - Proficiency in Laravel 8.x; - In-depth knowledge in configuring and using AWS, specifically EC2 and RDS; - Excellent communication skills to report progress regularly. Please only bid if you can perform these tasks efficiently and ...

I would like to create a solution (can be EXCEL, etc.) for creating working schedule, your solution must have these features: 1. Allow multiple locations, with different schedules and number of workers; 2. Setup multiple workers, set dayoff, hours per week, min hours per day and max hours per day; Example: The worker can have 2 days off (w2 = Monday, w3 = Tuesday, …), should work 48 hours per week, and 5 until 8 hours per day (in sequence, 10:00 – 15:00). 3. Views per week, per month (and per location or per worker) – generate a week / month schedule per location and per worker. 4. A random button to regenerate all again 5. And a button to make equilibrium (YES or NO), with YES on this button, your solution will try to adjust the schedule to ensure the &ldquo...

I need help setting up an SSL certificate for my AWS hosted website. The website currently hosts data for my company. I am looking to secure the site with a Domain Validation (DV) SSL certificate. The main tasks include: - Installation of the SSL certificate on the AWS server - Configuration to ensure that the SSL certificate is correctly applied to the website - Testing to confirm the SSL certificate is functioning properly Ideal Skills: - Experience with AWS hosting environments - Proficiency in SSL certificate installation and configuration - Django experience - Understanding of Domain Validation (DV) SSL certificates - Strong problem-solving skills - Good communication for coordinating tasks and providing updates.

I'm looking for a skilled web developer to create an E-commerce website from scratch for me and set up a domain for it. For this project, you'll: - Be designing and developing the entire site structure and layout as per the latest trends - While the client skipped on the preferred payment systems, your expertise on various payment integrations will be crucial in ensuring the most efficient system is put in place. - Although there is no time limit, I highly value efficiency and open communication about project progress. The ideal candidate should be an experienced E-commerce website developer with good knowledge of modern design aesthetics and functionality. Your portfolio should demonstrate your expertise in creating user-friendly, attractive, and efficient websites. Familiarit...

Project Description We are seeking a skilled React developer to create a frontend for our existing WebRTC-based application, which is designed for file transfers within the same network. The backend is built with Java using the Spring framework, and the frontend needs to integrate seamlessly with this existing setup. Key Requirements - React Frontend: Develop a clean and modern React frontend that interacts with our Java Spring backend. - User Display: The frontend should dynamically display users on the same network, allowing for interactive selection. - File Transfer UI: Implement a user-friendly interface for initiating and monitoring file transfers, including progress indicators and notifications. - Integration: The frontend must integrate with existing JavaScript code handling...

I need a professional who is capable of transferring and setting up my domain from to Google Workspace. I have the domain purchased already and an admin account with Google, I just need to setup an email account with Google. I also need SPF, DKIM, and Dmarc configured. I can pay $15 and it should be a pretty simple setup as I only need one email address configured.

...able to address this and provide a solution that enhances the sound quality and expands its functionality. Desired outcomes: - Improved sound quality: The primary goal for this upgrade is to have a noticeable improvement in the sound quality. The audio should be clear and crisp, enhancing the overall experience for our congregation. - Expanded functionality: We need our system to do more. The new setup should be versatile enough to accommodate different types of events and services, offering us greater flexibility. - Up-to-date technology: It's important that the final system is modern and up-to-date. We're looking for long-term solutions, so the system should be built with the latest technology to ensure its longevity and efficiency. Ideal skills and experience: - P...

I'm in search of a proficient Unity C# developer who can optimize my setup to handle multiple layers of graphics more efficiently. Key Deliverables: - Combine Background image, Foreground objects, and UI elements into a singular graphic. - Implement code optimizations to enhance performance on desktop computers. - Boost rendering speed, ensure smoother animations, and reduce lag. Ideal Skills and Experience: - Proficient with Unity C# and API. - Proven experience in optimizing code for performance. - Strong problem-solving skills to handle the amalgamation of different graphics layers.

I'm seeking an experie...Docker engineer to create a secure, clean Docker image, based on a Linux operating system. This image should be completely free from known vulnerabilities (CVEs). Key Features: - Container Isolation: The Docker image should be designed with efficient container isolation, avoiding potential security breaches. - Software: The Docker image should include Docker software. Skills & Experience Required: - Significant experience in Docker engineering and Linux operating systems. - Mastery in setting up container isolation in Docker. - Track record in designing Docker images free from CVEs. - Understanding of Docker software integration. I am looking for a seasoned professional who can promptly deliver a high-quality Linux-based Docker...

I am in need of a professional to sschedule and manage a zoom webinar and invite more than 100 prospects. The following tasks would be part of your responsibility: - Set up the zoom webinar with low interaction settings, i.e., only the host should be visible and audible. - Develop a full registration system for the attendees. An efficient solution that's easy for prospects to navigate is essential. Critical skills and experience include: - Proven experience in setting up and managing large webinar events. - An understanding and hands-on experience with the Zoom platform. - Experience in creating registration systems for webinars. Your primary goal is to ensure a seamless, hiccup-free event that provides a positive experience for all participants. This role requires strong techn...

I'm looking for a competent web designer who can make some necessary changes to my Bluehost website, along with some key updates. WORDPRESS proficiency is a must! Responsibilities: - Changing the layout: This will involve adjusting elements, colors, fonts, and the overall design style for a more modern and appealing look. - Updating the content: You'll be respo...is secure and optimized for search engines. Ideal skills and experience: - Proficiency in web design and development, particularly experience with Bluehost - Strong grasp of UI/UX principles and how to create a user-friendly website - Experience with SEO best practices - A track record of enhancing website performance and driving traffic through smart layout changes and engaging content - SSL setup experience on...

As an expanding e-commerce business, we're looking for a competent developer with expertise in Stripe integration. Specifically, we need someone to effectively set up the Stripe Marketplace Payouts functionality on our platform, which already possesses an active Stripe account. Our marketplace is set to operate globally and deals with both physical and digital products. Skills & Requirements: - Proficiency in - Extensive experience with Stripe integrations - Understanding of global e-commerce markets and regulations - Experience with both physical and digital product sales is a bonus. If you possess the relevant skills and experience, we'd love to have you onboard. This task requires a keen eye for detail and a deep understanding of the processes involved. Let's c...

I'm in need of an expert with outstanding knowledge of Forge Laravel, Linode, and nginx configuration to help deploy my Laravel application. You will employ the Forge Laravel server operating system for this project and will be required to set up a MySQL database to work in concert with my app. I'm looking for someone with: - A solid understanding of Laravel application deployment using Forge - Proficient skills in server configuration with nginx - Extensive knowledge of MySQL databases and their integration with Laravel projects - Experience with Linode If you are proficient in these areas, then you're the person I'm looking for. Please shoot me a bid and let's get to work!

1 - i have a dedicated server 2 - we want to do a monthly or weekly backup of all email accounts 3 - we want the backup to then be available to download to my local PC - if this process could be automatic where it does the backup and then downloads the file(s) would be great 4 - we dont want to backup on the server as we will run out of server space

You'll need to customize your UET tag tracking code to report a custom event. To do so, copy and modify the code attached and add to your UET tag tracking code. Needs to be done via GMT

Looking for a proficient C++ developer with expertise in building bots with specific functionalities. This zoom bot should enable automatic joining and recording of meetings in the Linux environment. Key tasks for the project: - Configure bot to autonomously join scheduled Zoom meetings. - Ensure bot records the complete duration of the Zoom meetings. Ideal skills: - Proficient in C++ programming, specifically for bot development. - Familiarity with Zoom API is a must. - Experience in developing Linux applications. - Ability to work independently with minimal supervision, as no additional software or system interaction is required for the bot. Please submit your bid detailing your proposed approach and previous work examples in the bot development field.

...know how to forward pass through 200 already trained PyTorch neural networks, and obtain their outputs, in <20ms, on a provided Linux server. This task is only for the ML inference step, and not for the training stage. Key Requirements: - Expertise in Python and Machine Learning: You should be well-versed in Python and have a strong understanding of machine learning principles. - Previous Experience in Speed Optimization: Experience in optimizing machine learning inference for high-speed applications is crucial. - Proficiency in PyTorch: Experience working with PyTorch specifically is highly preferred, as this is the library we are currently using. - Expertise in Linux - Knowledgeable about how to parallelize computations. Your responsibilities will include: ...

Looking for a proficient C++ developer with expertise in building bots with specific functionalities. This zoom bot should enable automatic joining and recording of meetings in the Linux environment. Key tasks for the project: - Configure bot to autonomously join scheduled Zoom meetings. - Ensure bot records the complete duration of the Zoom meetings. Ideal skills: - Proficient in C++ programming, specifically for bot development. - Familiarity with Zoom API is a must. - Experience in developing Linux applications. - Ability to work independently with minimal supervision, as no additional software or system interaction is required for the bot. Please submit your bid detailing your proposed approach and previous work examples in the bot development field.

I am looking for a professional...specific area. Your assistance would involve, but would not be limited to: - Setting up the Google Ads campaign; - Strategizing for targeting potential customers based on their location; - Monitoring the campaign to ensure the effectiveness; and - Adjusting as needed to achieve the main goal of lead generation. The ideal freelancer for this job should be: - Experienced with Google Ads campaign setup and management; - Proficient in audience targeting and strategizing; - Able to show previous successful campaigns with clea lead generation; and - Excellent at communication and understands the value of meeting project deadlines. This is a great opportunity for a patient and detail-oriented professional who is looking for a challenging yet rewardin...

Hello. We have an issue with our website. its server related. So we need someone to fix this ASAP. It takes more than 5sec for our website to load.

Hello, I'm looking for a freelancer to help me with a Python code project. I need the freelancer to create some code that can perform automated processes on a Linux platform. I don't have a preferred Python library so the freelancer can select one that is most appropriate for the task. The code should be well organized, bug-free, and efficient. I'm looking for a highly experienced freelancer to take this project on. If you think you have the required skills, I'd love to hear from you.

Please check the description on file: in attached file.

...developer who specializes in WordPress, Photoshop and Graphics for my e-commerce website. This isn't a typical setup, thus your creativity and eye for detail will be crucial. This is for a website that displays and sells fine art by an artist that will be printed and delivered to the customer. There will be a mixture of designs for printing on cups t-shirts etc as well as actual fine arts pieces that is sold as is. We will supply pics of the products to be sold. Key Responsibilities: - Tweaking an already setup Wordpress install that has an e-commerce template already setup - Creating graphic art for the site that looks modern based on products needed to be sold on the site - Setup navigation and e-commerce flow (already included with the template but...

Prosimo, vpišite se ali se prijavite za več podrobnosti.

I am seeking a proficient Linux system administrator with a focus on security implementation. The ideal candidate should have: - Solid experience with Linux operating systems - Specialization in security implementation - Demonstrable skills in maintaining the integrity and reliability of systems While it's not specifically addressed, a familiarity with safeguarding methods such as establishing firewalls, encrypting data transmissions, setting up and managing user accounts, and access could be advantageous. If you possess these skills, I would love to hear from you.

I'm looking for a professional to setup HubSpot and integrate it with Ring Central. Key functionalities I'd like to include are: - Contact Management: Manage between 1,000 and 5,000 contacts effectively. - Lead Generation and Nurturing: Initiate and foster relationship with potential customers. - Email Marketing Automation: Set up sequences, automations and triggers for streamlined communication. This project is for the utilization of my company's sales teams, so the ideal candidate will have a background in sales and experience in creating efficient lead management and sales automation systems using these platforms. They should be familiar with using HubSpot for managing large contact databases, lead generation and nurturing, and email marketing automation. Expe...

I have a costumer list that usually contact with email. I need a system for send bulk message on them Whatsapp number. Note: you don’t have to coding a program. Just setup a program that already work for do that.

I urgently need a comprehensive security check on my netw...network and servers. In particular, the focus areas should be: - Firewall and network infrastructure - Operating systems and software - User access and permissions - Internal server coding and potential backdoors Even though I didn't specify any compliance standards for you to follow, a good understanding of common ones like PCI DSS, HIPAA, and GDPR would be beneficial. Skills and Experience: - Expertise in network infrastructure and firewall setup - Thorough understanding of different operating systems and their vulnerabilities - Experience with user access management and permission settings - Knowledge in server coding and identifying backdoors I can't stress enough the urgency of this proje...

I am looking to build a service-based business specifically offering consulting services. For this project, I need a professional with experience in setting up such businesses. Ideal Skills & Experience: - Proven track record in setting up service-oriented businesses - Expertise in Consulting service operations - Comprehensive understanding of service-based business marketing Tasks Include: - Establishing Detailed Business Plan - Identifying Key Market Segments - Formulating Operational Strategies - Providing Marketing Recommendations - Offering Maintenance Plans This project is suited for those who've got great entrepreneurship skills, understand the ins and outs of a consulting business, can provide unique and strategic business ideas, and are passionate about helping others...

...Requirements: - The template must be designed such that it's most suitable for images. Visual appeal and ease of use for images is a priority. - Every aspect of the layout should be fully customizable. This includes but is not limited to the placement of elements on the page, the size of different sections, and the overall structure of the design. - The template should be designed for a 1 page setup. - Although the focus is on images, other content types like text and videos should still be able to be added with ease. Ideal Skills and Experience: - Proficiency in Adobe Photoshop to create a high-quality .PSD file. - Experience in designing templates that are optimized for a specific type of content. - Understanding of the principles of user experience (UX) and user interfa...

...like mailboxes and phone numbers directly through our application. Develop a user-friendly interface that allows end users to easily establish and customize communication suites for each project. This includes setting up dedicated phone numbers, mailboxes, and options for WhatsApp or calling. Ensure that the application handles all API interactions with Twilio in the background, automating the setup process as users configure their preferences. Design and implement these features to integrate smoothly with our existing microservices and database systems. Requirements: In-depth knowledge of Node.js and extensive experience with the Twilio API. Demonstrated expertise in creating user-friendly interfaces and integrating APIs within a microservices framework. Strong problem-solving ...

I'm looking for a farm engineer who can help design a small 5000 sqm farm. While I have not yet decided on whether it will be organic or conventional, I do know that I plan to grow a mix of fruits and vegetables, thus experience in these areas is highly valued. Key Requirements: - Design a comprehens...a comprehensive small farm covering 5000 sqm - Ability to design for both organic and conventional farming practices - Proficiency in irrigation system design Ideal Skills: - Farm engineering - Crop-specific knowledge (fruits and vegetables) - Irrigation system design - Familiarity with organic farming practices - Ability to adapt to the client's needs and decisions regarding the farm's final setup If you have experience in these areas, please reach out to discuss th...

...robust and scalable AWS infrastructure for my project. The scope of the project includes the following tasks: 1.⁠ ⁠*Server Setup*: Configure multiple server instances to ensure optimal performance and redundancy. The servers should be set up in chunks to facilitate easy management and scalability. 2.⁠ ⁠*AWS RDS Integration*: Integrate AWS Relational Database Service (RDS) for efficient database management. The RDS should be configured for high availability and automatic failover. 3.⁠ ⁠*SSL Implementation*: Implement AWS Wildcard SSL to secure all subdomains under a single certificate, ensuring the security of data transmission across the network. 4.⁠ ⁠*Load Balancer Setup*: Implement an AWS load balancer to distribute incoming application traffic across m...

Are you a wizard with Google Tag and a maestro with Prestashop? Do you have a keen eye for detail and a creative approach to conversion tracking? If so, we have an exciting opportunity for you! We are currently seeking a highly skilled Google Tag and Prestashop expert to conduct a thorough review of our existing setup on our Prestashop website. Your mission, should you choose to accept it, will involve verifying our current configurations, ensuring that our Google conversion tracking is not just operational but optimized for maximum efficiency. What We Need From You: - Expertise in Google Tag Manager and conversion tracking. - Proficiency in Prestashop, with the ability to navigate and optimize its settings for enhanced tracking capabilities. - A creative mindset when it comes to ...

I am seeking an expert network administrator who can professionally setup, configure, and optimize my ISP's network infrastructure. The ideal candidate should have a solid background in the following: * Setting up and configuring a range of switches, primarily focusing on optimizing VLAN configuration. * Clear understanding and experience implementing Arista MLAG / TOI. * Identifying and addressing network hardware issues feasibly and promptly. * Developing and documenting network procedures and guidelines. Demonstrated experience with complex, large-scale network management is highly desirable. Previous work within ISP or similar environments will be viewed favorably. Preferably an Arista specialist!

I am in need of an experienced developer who can configure Oauth to allow my SuiteCRM application to authenticate with Google SMTP server. I have access to both the SuiteCRM application and Google SMTP server, yet my SuiteCRM is the latest version available. Skills and requirements: - Experience setting up Oauth authentication for Google SMTP servers. - Knowledge on SuiteCRM configuration. - Ability to guide and assist in registering an application on the Google Cloud Platform. Roles: - Configure Oauth to connect SuiteCRM to Google SMTP server. - Provide guidance on registering an application within the Google Cloud Platform. - Ensure everything is working smoothly with the latest version of SuiteCRM.

I'm seeking a proficient Airtable professional to assist with a few key tasks - specifically data entry, database setup, workflow automation, budgeting, and tracking. Key Responsibilities: - **Data Entry**: Inputting a small set of records, less than 100, into the system. - **Database Setup**: Organizing the data in a structured and efficient manner. - **Workflow Automation**: Creating a seamless and automated workflow. The complexity level is primarily focused on integrating with other apps and services. The ideal candidate should have prior experience in: - Airtable data entry and database setup - Building and implementing workflow automations - Integrations with various apps and services - Budgeting and tracking functionalities Your role is pivotal in ensur...

I require a knowledgeable individual to seamlessly upload all products to my new Shopify store from a CSV file, which contains product names, images, and descriptions. The expert will also set up an organized system for product collections, categorised by product types. Key Requirements: - Proficient in utilizing FTP files for shopify product upload - Skilled in Shopify product collection organization - Effective mastery of CSV file usage with specified fields including product names, images, and descriptions. Looking forward to reliable bids. Please, only bid if you are fully capable and have handled similar tasks. Thank you.

In need of an expert to install Odoo 17 on my Ubuntu VPS hosted with Vultr. The key tasks for this job include: - Setup and configure Odoo 17 - Ensure that the key modules; Sales and CRM are pre-installed Ideal Skills & Experience: - Profound experience with Odoo installation - Familiarity with Ubuntu operating system - System administration - Experience with VPS hosting particularly with Vultr. Please, your proposals should indicate your experience with these systems and any similar projects you've handled in the past. Looking forward to working with you.

Our Cloudflare for .com url was deleted be mistake. Please re-instate. As an advanced user of Cloudflare (or similar tools), I'm looking to further capitalize on its offerings to enhance my website's performance and increase its security. The essence of this project lies in: - Improving website speed: The primary objective is leveraging Cloudflare to make my site load faster. Therefore, applicants must be proficient in diagnosing and fine-tuning page loading times using Cloudflare. - Boosting security: We also aim to increase the safety of our domain and a subdomain using Cloudflare's security features. To execute this task successfully, prior experience with Cloudflare is crucial, given its complexity. Understandably, a strong background in website speed optimization a...

I'm looking to create a live streaming app and server that can broadcast kite flying events. Key Features: - The primary purpose of the app and server is to broadcast these events in real-time. - The app should be available on both Apple and Android platforms. Mandatory Features: - The ability for users to register and log in is essential for this project. Ideal Skills and Experience: - Proficiency in app development for Apple and Android. - Experience with live streaming app and server development. - Prior projects involving user registration and log-in. - Interest in or experience with kite flying events would be a plus. Please let me know your relevant experience and any ideas you may have for this project.

I am in need of an experienced Shopify developer who can set up my store for service-based products and integrate it with PayPal for payment processing and Twitter for social media engagement. Key Requirements: - Setting up a Shopify store tailored to service-based products. This includes designing the layout, adding necessary pages, and ensuring a user-friendly shopping experience. - Integrating PayPal as the primary payment gateway. The process should be seamless and secure, ensuring customers feel comfortable making payments on the platform. - Integrating Twitter to the Shopify store for social media engagement. This includes the ability to share products, discounts, and promotions directly to Twitter through the store. Ideal Skills: - Proficiency in Shopify, particularly in setting ...

I'm looking for an experienced Shopify developer who can help me set up my online store. Here are the key re...would like the store to be designed with flexibility in mind. - I'd like the store to be set up with the necessary payment gateways, ensuring a smooth customer checkout process. - Social media integration is also a key requirement, so that customers can easily share products and the store on their social media platforms. In your proposal, please include: - Your relevant past work in Shopify store setup and design - Your experience in integrating payment gateways with Shopify - A detailed project proposal, outlining your approach and timeline for setting up the store. Please only apply if you have the necessary experience and can deliver a high-quality, profes...

...looking for a proficient freelancer to set up a Linux web server and a database server on Ubuntu. The requirements are as follows: - Web Server: Please configure Nginx to serve as the web server. Ensure it's properly installed and optimized for performance. The access to the server should be via ssh keys only. Also provide information on how to set up permissions for individual Laravel projects in /var/www folder. - Database Server: Set up a MySQL database server. Create a database and a user with appropriate permissions and ensure everything is secure. - Security: Implement necessary security measures to harden the servers and ensure the installation is safe from common vulnerabilities. Ideal candidates should have: - Pro...

I'm looking for an experienced developer to Dockerize my application and upgrade my ASP.NET Core 2.1 project (currently version 2.1.0) to .NET 6. Key Responsibilities: - Create a Docker file based on the Linux operating system. - Upgrade my project from ASP.NET Core 2.1 to .Net 6. Skills & Experience: - Robust knowledge in working with Docker and Ubuntu. - Proficient in .NET 6 migration from ASP.NET Core 2.1. - Ability to handle project dependencies while upgrading (specific packages or dependencies may be discussed later). The successful bidder will show excellent knowledge in making a seamless transition with minimal disruption. Looking forward to your reliable assistance. Note: You need to complete the work through remote access.

I'm looking for a skilled professional who can create and manage content for my business across various social media platforms, specifically Facebook, Instagram, LinkedIn, and Tik Tok. The main goal of the content creation is to generate leads, so a strong understanding of lead generation strategies in a social media context is key. Key Responsibilities: - Develop engaging, informative, and promotional content for 5 posts per day across all platforms. - Tailor posts to the specific audience and platform (Facebook, Instagram, LinkedIn, Tik Tok). - Set up LinkedIn and Tik Tok accounts for my business. - Create a content strategy that is aligned with the brand's objectives. - Optimize posts for lead generation without compromising on quality and engagement. - Create and run success...

I'm seeking a talented game developer to build a Metin2 server from scratch. A fundamental objective of this project is to achieve an exciting Player vs. Environment (PVE,PVP) setup that promotes competitions as well as a cooperative gaming experience. Key Focuses: • Balanced Gameplay: All characters- Sura, Lican, War, Shaman, and Ninja- should be equally prioritized during the game's balancing. This aims to ensure a fair and enthralling playthrough for all users. • Feature implementation: Your role will include generating engaging quests and multi-level dungeons that increase in difficulty as the player progresses further into the game. A dynamic crafting system is also envisaged to enrich the gaming experience. Ideal Skills: • Previous experie...

I am looking for a knowledgeable freelancer well-versed in enterpris...firewall for my network. Key responsibilities will include: - Firewall installation: You'll need to set up the firewall from the ground up, ensuring that it is correctly integrated into my enterprise network. - Rule setup: I have specific requirements for firewall rules. This will include blocking certain IP addresses, setting up VPN connections, and controlling web access. You should be experienced in implementing these types of rules efficiently and accurately. The ideal freelancer for this project has extensive experience with enterprise network security and firewall setup. Knowledge of VPNs, IP blocking and access control is critical. Please only bid if you are confident in your ability to fulfi...

Tasks: - help on migrating WHM CentOS7 system to AlmaLinux8 - complete system check for any problems updates and safety issues + complete backup