We're running Time Machine on our SL server and recently purchased a Drobo S with the intent to perform regular local backups of the whole server. However, it's not really useful for us to keep backups older than a couple of weeks or a maximum of one month. We just don't need that kind of redundancy and really it's the last week or two that is interesting in case of a catastrophy.
However, I can't seem to find any way of limiting the age of the Time Machine backups to correspond with our demands. To me it seems like it simply eats all available space and if the space is depleted THEN it starts to remove old versions. This seems woefully inefficient, especially considering that Time Machine doesn't seem to store deltas but actual whole copies of the modified files which in itself is inefficient (although, it might make sense).
So in short, is it possible to limit the age of the time machine backups?