I was reading through this thread and feeling rather smug about having ditched Windows for Linux several years ago when I realised I hadn't backed up my files for a long time. I back up to an external USB drive which only gets plugged in for this purpose. Files I make on the computer are all saved to one compartmentalised folder. Backup means copying this folder to the USB disk. 16.1 gig, originally estimated at taking 3 hours 23 minutes. Ten minutes later estimated as 3 hours and 30 minutes and now an hour later estimated at 3 hours and two minutes. I've got maybe 100 photos, some .wav files and a few videos. I'm doing it with USB 2, and I think I might have one USB 3 socket on th back of the case. I'll check before doing it again.