A while back, I realised that com.apple.bird was getting too large and it was easy to purge it. I had to do this again.
The app I use to see where my space is going is OmniDiskSweeper. Its free, and I highly recommend it.
I use Arq to handle backups (in addition to Backblaze, and CrashPlan), and today I noticed that ~/Library/Arq/ had a huge (32.7GB) Cache.noindex. Apparently it is safe to delete, so that’s what I have done.
I also notice a large /Library/Backblaze.bzpkg – 8.1GB – and apparently you can’t delete it. The penalty you pay for keeping offsite backups?
Anyway, I suddenly have a lot more free space. Its annoying that I’ll have to keep track of all this from time to time, as one has to occasionally perform some housekeeping of one’s Mac.