The next version of Mastodon can't come soon enough.
About 20GB of disk space on my instance are being taken up by media from remote users. And this is for a single user instance! I can't imagine how it must be on other instances with multiple accounts.
A recent PR should make things much better though by allowing you to remove these files.
The only thing you need to do is pass the
--prune-profiles flag to the
media remove CLI command.
The PR is already merged so hopefully that means it's coming the next release.