Tarsnap is a no nonsense backup service for Unix (Linux, Mac etc) and is very nice indeed from a sysadmin’s point of view. It is inherently uber secure by design. It somewhat lacks being end-user friendly though – for example it doesn’t handle expiry of archives out-the-box. Therefore if you wanted GFS style rotation you need to wrap it in something which handles deleting old archives according to whatever deltas.
Their payment model is a bit strange in that it is prepay so you get a warning email when running low on credit or risk having your backups deleted for good. The cost of a particular backup run can Read More