backup server (bungei) volume filled up

Bacula backups have started failing today, amid warnings about free space on the server.

@anarcat investigated and found out that archive-01 that has grown seemingly out of control:

yep, so archive-01's /srv/archive.torproject.org/htdocs/tor-package-archive/torbrowser is 5TB

Space reservation was reduced from 0.5 to 0.01 percent which should give enough room for the upcoming backup to succeed.

Next steps:

• reduce reserved space
• grow logical volume
• unlock mounts
• make sure the archive-01 job completes
• make sure all backups have ran in the last 24h (ie. make nagios green again)
• open a ticket for or just make a plan for the next time
• document this in the backup pager playbook