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I was looking for a small solution that can be used to back up photos/media whilst traveling, but most solutions require a computer - whilst there are solutions that are essentially a harddisk wrapped in h/w with an SD or CF slot that perform basic backup. These solutions however are relatively expensive (200GBP + range) and they are providing limited functionality. Other options would be simply to buy more CF/SD cards but I've always found these to be a waste since they become redundant with the next camera upgrade.
Therefore, the realistic option was to look at a laptop... but new lightweight laptops are expensive. However there was a market segment in ~2009-2012 that may fit the requirements: netbooks. Netbooks were a range of small/lightweight and inexpensive laptop that filled a market that has since been dominated by the popularity of iPad and other tablets. The netbooks were relatively small but under powered laptops with a generation of mobile processors (typically, the Intel Atom) that was designed, seemingly, for internet access and minor word processing/office tasks - as such netbooks were usually installed with Windows XP or a slimmed down version of Windows7 (called 'Starter') although some Linux variants were shipped by manufacturers.
So the hunt was on - and after some initial considerations (keyboard layout -
where's the pipe key?!?) the HP Mini 210-3025sa was the one I targeted on eBay at the time.