[Duplicity-talk] remove-older-than

[Steve Crook]

According to the duplicity manpage:

 --remove-older-than time
   Delete all backup sets older than the given time.  If old backup
   sets  will  not be deleted if backup sets newer than time depend
   on them.  See the TIME FORMATS section for more information.

My backup configuration performs an incremental backup each day and then
a full one each week.  Because of the full one, I wouldn't expect newer
backup sets to depend on anything older than a week. This expectation
seems to be false as the size of my backup filesystem still increases
over time until I forcefully delete the content and invoke a manual full
backup.

Can anyone suggest a backup strategy that will not incur this manual
intervention every few weeks?

Regards
Steve