Obsidian is a note/knowledge management tool I’ve used a fair amount in the past (before moving to nb). Below I log some considerations I dealt with whilst using Obsidian.
Self-deleting files
When I used Obsidian, I synced it to my devices using iCloud (though I don’t know if this is relevant to this particular issue). At various points, I noticed that some notes would completely disappear. Sometimes this would happen even whilst I was editing them, or I would see the note contents just go blank whilst the note was open. This was stressful if I was in a meeting or needed the note at that time (though luckily cmd-Z would usually re-surface the note contents back into the buffer).
It turns out this seemed to happen becuase the Mac’s disk was full (I think I was syncing large backup files between devices at the time). When I cleared space on the disk, this issue stopped happening.
On a related note, I did find Obsidian’s lack of visual feedback on note saving to be disconcerting here, since it’s abstracted away from you (you just have to trust things are being written to disk – though, in this case, they weren’t!).