I have an iMac running 10.7.5 OS. My girlfriend has a MacBook running the same OS. I have used Time Machine once to back up the iMac to a external 250gB HDD - but am looking at purchasing a larger HDD that I could use to back up both iMac and Macbook over wifi. Also, we are about to go on holiday and the GF is a big camera nut and will take loads of photos. We are planning on taking the Macbook with us, but I'd like a way of backing up the photos we take whilst away to either the iMac or the wireless HDD in case we lose the Macbook / camera / memery cards etc. After a bit of googling the Time Capsule option seems it might help. Also there is something called 'Back to My Mac' in the iCloud settings that I do not understand. Could any of these provide a solution if configured correctly? Please keep answers in layman terms as I am not really conversant in IT terminology. We both have Apple IDs, iPhones, and we have an iPad 2(16gb, Wifi only) if that adds to the options at all - though I tried to backup my iPhone to iCloud and I don't have enough storage (thought the iPad seems to be working as I type). Backing up photos to home when you are on holiday is probably a non-starter unless you can find very fast Internet access. The best bet is a