Digging in to why I was out of disk space I discovered that files in /Library/Caches/com.sophos.sdr are eating up 200G of my 512G disk. This got my disk to 100% full (though I've been micro managing my disk space for months now without realizing where it was going - the folder is root only so it was only showing up as 'hidden space').
The contents of the directory is almost 2000 folders named rca_<18 numbers>, each almost 500mb space containing two files:
rca_132277714735302080:total 949960-rw-r--r--@ 1 _sophos admin 486365198 Mar 3 20:58 12e349b1-88b1-24b3-f9c6-6bc60ddc831c_132277714735302080_snapshot.txt-rwx------ 1 _sophos admin 10240 Mar 3 21:02 12e349b1-88b1-24b3-f9c6-6bc60ddc831c_20200304T045754Z.tgz
The files seem recent, the earliest ones are 6 days old (march 3) and the most recent ones are at the current time of the current day (march 9) - so I don't know if this is a process that's not purging old files.
Anyway, can anyone help me figure out how to clean up the 40% of disk space this is taken up? Is it a setting somewhere I can modify for this, if it's something to do with my computer, or what.
As an aside, my computer never seems to complete a scan, even when triggered manually. The last completed scan was Jan 16 (almost 2 months ago). I don't know if the scan simply fails and never completes, or what. Not sure if this is related.