Allow 2 days as minimum of backup increments in rsync

Hi!

For rsync backup, please define the minimum number for 2 days. I think 2 days are enough to have rotation.

Actually it needs 5 days and it's a lot for my home backup.

number of backup increments (min = 5)

Thank you

(from redmine: created on 2010-04-02, closed on 2012-01-01)