So.....

I've previously mentioned that space was running low on my current NAS. This past week I got down below 700GB free. Let's call it 650GB. That's been constant for some days now. Until...

Today I get a warning email from the NAS saying space is running low and that I'm currently at 330GB free. Hmmm.. WTF!? Where did over 300GB just disappear to?

I only did one thing yesterday which was out of the ordinary...

Yesterday I re-enabled some Mac-to-NAS rsync backups (from the NAS UI) that I had disabled for some months. I had 2 backup jobs and only one of them would work, so I only kept the one turned on. Since it's RSYNC, it's incremental and most everything already existed on the NAS. The total backup folder was only about 265GB and I can't see more than 20-50GB of that being newer content that didn't previously exist.

I can't see these backups being the missing data. I killed the backup share completely and that gave me some 280GB of additional space. I still think I'm missing 300+ however.

I'm at a total loss for ideas at this point.