« Reply #12 on: Wednesday 24 September 14 20:06 BST (UK) »
I personally wouldn't rely on a single external hard drive because, as with any hard drive, they can fail. OK there is really only a small chance you could lose your external hard drive at the same time as your desktop/laptop hard drive, but it is possible. I tend to use two and alternate which one is used for a manual backup, neither are left connected permanently to the laptop though, but that is just my personal choice. I managed to kill an external hard drive a few years ago when I inadvertently knocked it when it was copying files off a previous laptop. It fell over and bent the controller head so the hard drive was unusable so I lost what was on it.
Obviously, anyone's backup solution is their choice but its worth remembering that hard drives, as with USB memory sticks, can die just as easily as an internal hard drive and with the price of external drives not that high these days, it may be worth investing in a second one to alternate backups. I would personally purchase a different model and/or make to an existing one just in case there is a fault with the particular model, but then perhaps I'm a little to paranoid about these things.

That said, although I alternate backups to different external hard drives, I probably don't backup as often as I should.

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