For me it is not recording credentials with the assumption I would simply remember them later, while having every opportunity to archive them before eventually forgetting. Also, not keeping detailed enough notes & photos of exactly how my hardware is attached.
Right… sure… erm… of course I do, obviously 😅
Actually I always mean to do it but I keep forgetting… Recently I’ve resigned myself to the fact that I’ll never remembering to do it so I’ve been trying to set up an auto-sync to my NAS with rsync and inotifywait so I won’t have to ever think about backups again… But I really suck at coding so it’s not going too well 😅