Windows 10: How to recover files after reinstallation of windows 11 operating system?

Recently, my dell computer was fixed and they had to reinstall my operating system. Beforehand, they told me that doing a simple windows backup also all of my previous windows backups would save my files/data and I could restore them afterwards. Unfortunately, I cannot find my files at all. They aren't in one drive, file history, recycle bin, file explorer, and when I try to restore any of my previous backups, it states that there are no backups at all so I can't even restore them. Is there anyway I can restore my operating system to before my laptop was repaired or anything I can do at all.

:)

 

Possible to recover raid

ok so it said i need 3000tb of storage to recover.

trying w1zzards suggestion.

the raid was never disabled, it was still intact but when i reinstalled xp it showed up as a fat12 file system.

 

Need to recover files from my Memory card

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Recover files from Flash drive

According to me, the best flash drive recovery software which i have used and recovered files easily. It is very easy to use and within few steps you can recover data from flash drive. http://billhoyer.com/recover-corrupt-flash-drive-mac