repair a mac laptop that has somehow lost all data, including icloud and cloud drive backups

we have a mac laptop. For some reason it lost all the data. Operating system is there, but all files are gone, all records, Even the cloud backups. We need this fixed. I know here is a way to get this data back. Apple says it was a glitch and has been no help at all. You will need remote access and a LOT of good ratings.