Dropbox
That's what I do, I put them in Dropbox on my PC, and then I have Dropbox sync them to my Linux netbook. That way I have an automatic backup.
As to how long Dropbox is likely to stay in business, it's hard to say, internet companies vanish all the time. On the other hand, it always comes out very well when programs of this type are reviewed by computer magazines. So I use it, but I do external backups too (to detachable hard drives). I'd never trust important data exclusively to 'the cloud'.
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