Disk space cleanup

Product Support Self-hosting
5

Of course, how silly of me.

The output of du -cha --max-depth=2 /var | grep -E "M|G"

2.1M    /var/backups
12K     /var/discourse/README.md
2.2M    /var/discourse/.git
2.7M    /var/discourse
54M     /var/lib/mlocate
36M     /var/lib/dpkg
190M    /var/lib/apt
18G     /var/lib/docker
18G     /var/lib
3.4M    /var/log/btmp
1.2M    /var/log/auth.log.3.gz
4.1G    /var/log/journal
1.2M    /var/log/auth.log.2.gz
42M     /var/log/btmp.1
1.6M    /var/log/auth.log.4.gz
7.9M    /var/log/auth.log.1
6.5M    /var/log/auth.log
4.1G    /var/log
1.2M    /var/cache/man
312M    /var/cache/apt
2.8M    /var/cache/snapd
4.9M    /var/cache/debconf
320M    /var/cache
46G     /var/docker/shared
46G     /var/docker
68G     /var
68G     total

DIgging deeper into /var/docker/shared and /var/lib/docker:

15G     /var/docker/shared/standalone/postgres_data
6.8G    /var/docker/shared/standalone/backups
14G     /var/docker/shared/standalone/uploads
43M     /var/docker/shared/standalone/redis_data
69M     /var/docker/shared/standalone/log
12G     /var/docker/shared/standalone/postgres_data_old
14M     /var/docker/shared/standalone/letsencrypt
46G     /var/docker/shared/standalone
46G     /var/docker/shared
46G     total

17M     /var/lib/docker/image/overlay2
17M     /var/lib/docker/image
14G     /var/lib/docker/overlay2/ed229eed209ffa6339adc9de9033c12487732c74572a3dc608eb32d720d1837c
1.2G    /var/lib/docker/overlay2/7448f4eb6c5a9e09b0a5537aa454c30221ab95314418eac9078c7c774de784e2
2.4G    /var/lib/docker/overlay2/8a7ca976e2c8b362302c2abb95d306520206bf3e6125672b160b19e150d1f914
88M     /var/lib/docker/overlay2/c6cd5a3006efb2457f3bba70450a85c42f53bfc7cdc3416fb6cfb5990e2eed72
1.1G    /var/lib/docker/overlay2/9f8a463bdc03f518d6f25a7c11873122bf858a266fd6ca40ea19dfb4a78e1f8d
18G     /var/lib/docker/overlay2
18G     /var/lib/docker
18G     total

Offhand, postgres_data_old looks suspicious. Is that safe to clean up?