ddar: de-duplicating archiverddar ddar is a free de-duplicating archiver for Unix. Save space, bandwidth and time by storing duplicate regions of data only once. Use ddar to: Back up local data to a remote server, each time saving space, upload bandwidth and time by only transferring data not already present on the remote server. This is what cloud backup services like Tarsnap allow you to do already. Now you can use your own
