I hope that you guys can help.
I have a small setup with a RP4 with 2*4TB USB disk connected, the 2 disk are created as a singe disk via Union Filesystems, and because one disk are full, all new files are written to disk 2.
Everything have been running fine, but after a power outage last night, I've seems to have lost multiple folders that have been created after end of July.
I've disconnected disk 2, and did a fsck -v on the disk on a Linux PC, just to make sure that there didn't were any issues with the filesystem. It did find some issue, but I don't think they are related to this issue.
I think it's strange, that it seems like all files that have been added after a given point is gone, all other files are fine. Have you seen this kind of issue before, could it be an access issue to the file, so I can't see them?