&gt; bup currently has no way to prune old backups.<p>As a Mac (and therefore Time Machine) user in the process of switching to Linux, this seems to be a big downside.<p>[...]<p>&gt; Until we fix this, one possible workaround is to just start a new BUP_DIR occasionally, i.e. bup-2013-10, bup-2013-11...<p>And the workaround mostly defeats the purpose of incremental backups.