[...] Foldershare is another tool that could potentially be used for a backup system of sorts. I used Foldershare to actually share documents and project files while I was at school but I could see it being useful for backing up files between computers too. Foldershare was previously a stand alone company but they were acquired by Microsoft (see the funny thing that happened when they were acquired here and then here). File updates are sent from machine to machine on a peer to peer basis over an encrypted link. Your files are never sent to a central storage server so they are safe from prying eyes. Best of all is the cost – absolutely free. And in this case the software is available for Windows and Mac. Don’t even hold your breath for a Linux version though. [...]