So, now that I got WOL working my next step would be to contemplate a backup solution for my NAS. I did a couple of quick searches but couldn't find any how-tos or articles about NAS backup. I would like a system where the changes I make to the NAS filesystem is instantly updated on my backup drive (or at least once a day). Any suggestions as to this? What kind of media should I go for (external harddrive, memory stick etc.)? And how can I set it up?