[Systems] Weekly and monthly backups

[Bernie Innocenti]

This should save us a ton of disk space without bringing up weird
filesystems with reflinks and compression:


http://codewiz.org/gitweb/wizbackup.git/commitdiff/7c061b438673833744dc9c3db70ed82d1d5c00db?hp=7525deb315bef85b8616bb3babf1e737d509455e

If we still cannot fit the backups after this change, I'll look into
btrfs + reflinks.

-- 
 _ // Bernie Innocenti
 \X/  http://codewiz.org