Instead of being transferred to the backups server (or maybe they have and just not been automatically deleted locally), it seems the backups have remained locally on db112 causing the disk to be full every few hours and therefore render Matomo and Phabricator inaccessible unless someone deletes binlogs every few hours.

I'm not sure whether they've just not been deleted locally but have been actually backed up or if the backup didn't complete because of lack of space (which I suspect).

Leaving High as the current situation (down every few hours) is but if we decide to delete the backups for phab/matomo for now then this can be downgraded until a more permanent fix is found to for local storage (split them into two)?