I nearly lost the Lightroom catalog with of all my photos
Time Machine backups should live on Apple Filesystems. The Ext4 or btrfs in Synology's is a timebomb for Apple's proprietary data blobs. It has something to do with the filesystem attributes.I asked my father to just give up on it. Just manage pictures through the file system. Photos (former iPhotos) databases also get corrupt on a Synology NAS. It's a matter of time. The strange thing is that it can go well for months on end, giving you a false sense of security.Do iCloud or local drive backups or stay away from Time Machine and Apple Databases is my advice (although my father had a lot of problems as well with an "incorrectly unplugged" external HFS+ drive). I can't find the sources right now but after my father's last drama (and there have been several) I did some intensive searching and this was my conclusion.