find -delete

find /path/to/directory/ -mindepth 1 -mtime +31 -depth -print
find /path/to/directory/ -mindepth 1 -mtime +31 -delete

Related

• duplicity remove-older-than time
• duplicity remove-all-but-n-full
• -name

No space left on device

See also

• rm, System Integrity Protection, truncate, scrub, shred, unlink, git rm, find -delete
• find, find ., ls, findmnt, locate, -mindepth, -name, -delete