And more than one copy too. Most people keep one copy of everything, just as protection in case a disk breaks or gets suddenly wiped out. So your backup contains the cracked version of your files.
But what you really need to protect you from a crack, or various other forms of losses, is a multilevel rotation scheme. Have one copy from last night, but also a copy from each of the last 7 nights, and one copy from each of the last 7 weeks, and one copy from each of the last 49 weeks, etc.
That way, when you find out that someone put a backdoor in your system a few weeks ago, you can restore the original files (which probably hadn't changed for years before that).
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