A partition, uniquely reserved for backups, was running out of space. To immediately free some space, I decided to remove the 5% reserved disk allocation (that's the ext4 default) and set it to 0%.
df before:
/dev/mapper/vgdata2-backup ext4 906G 856G 3.7G 100% /backup
command:
tune2fs -m 0 /dev/mapper/vgdata2-backup
df afterwards:
/dev/mapper/vgdata2-backup ext4 906G 856G 50G 95% /backup
Fast and easy.
Side note: Never do this on your system partition!
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