Net Book-No CD drive-How to back up?

Wife uses a Acer netbook with Windows 7 basic. No CD drive. Is there someway you can back up a netbook in case it crashes? Thanks!
 
As mentioned a USB flash drive or external hdd. You could also use a USB DVD writer, backup to a drive on a network or even one of those internet based data storage services. I personally prefer an external USB hdd to do backups for all my systems.
 
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