I had two identical copies of a backup, on two different PCs.
I decided to cut and paste them on boxcryptor X: - onedrive folder, to encrypt, with the onedrive client closed (in order not to change the time stamp and take up more space).
On one of the two systems I use Windows RAID 1 (software).
However, this seems to have caused a large loss of files
on one of the two systems higher than the other (I've never opened onedrive client after the "copy").
Towards the end of the copy, Windows warned me that some files were gone and it can't copy anymore!
In one of the two systems I lost about 30GB of files,
in the other a few GB.
What may have happened!? 🙁