Added --sleep-ratio option after hearing that rdiff-backup was too hard on hard disks (thanks to Steve Alexander for the suggestion).
Quick example: --sleep-ratio 0.25 makes rdiff-backup sleep about 25% of the time.
Maybe this will help on bandwidth usage also.
Fixed -m/--mirror-only option.
Added --exclude-other-filesystems option.
Thanks to Paul Wouters for the suggestion.
Added convenience field TotalDestinationSizeChange (total change in destination directory - mirror change + increments change) to session_statistics file.
Handle a particular situation better where a file changes in a certain way while rdiff-backup is processing it.
Before rdiff-backup would just crash;
now it skips the file.
Thanks to Scott Bender for the bug report.
A couple interface fixes to --remove-older-than.
Added some security features to the protocol, so rdiff-backup will now only allow commands from remote connections.
The extra security will be enabled automatically on the client (it knows what to expect), but the extra switches --restrict, --restrict-update-only, and --restrict-read-only have been added for use with --server.