Not to hijack this thread, but has anyone got a link to an idiots guide to back-up storage? I have been working from home for 9 months or so and have most of the files from this time on my PC rather than work servers for accessibility issues. I have got a back-up of the files on a portable hard drive, but what I guess I really need is a piece of software that will copy over only those files that haven't changed rather than having multiple copies of everything - does such a thing exist? The Synology NAS mentioned above is a couple of hundred quid at the starter end of the scale, which I didn't really want to pay for work files, but might have to if nothing better can be suggested! TIA.