So today I had a notification that my NAS storage was up to 85% used space. Thats weird because I usually have 50% used (2TB) so I checked with ncdu to find the culpit. Well, it was a fsarchiver backup file that was 1.2 tb, when it should be 20 gb. I tried to delete the file but to my surprise it was locked, so I did htop and found this:
Running time 7hs.