arq supports, as one of its transport mechanisms, plain old SFTP. rsync.net, by default, has daily[1] ZFS snapshots enabled on your account. It's basically ti

arq supports, as one of its transport mechanisms, plain old SFTP. rsync.net, by default, has daily[1] ZFS snapshots enabled on your account. It's basically time machine, but more space efficient since the snapshot "diff'ing" is block based rather than file based. So a very simple solution would be to arq your data to an HN-reader-discounted rsync.net account, and let our back end do the time-machining. As a bonus, you can do neat things like this: ssh 1234@usw-s001.rsync.net md5 some/file mysqldump -u mysql db | ssh 1234@usw-s001.rsync.net "dd of=db_dump" ssh user@rsync.net s3cmd get s3://rsynctest/mscdex.exe [1] You can specify any time interval, but >7 dailies counts against your quota...