Need advice re crash protection

I have a small business and use a notebook constantly. I also have a
desktop but I use it very little (I'm hndicapped and it's somewhat difficult
to access.) Anyway, I was fooling myself that the desktop was a backtop
but it's way data-outdated now. And it suddenly occurred to me that if my
laptop crashes, I'm in trouble.

I have around 15G total data, including programs, on the laptop. Am I
right
in supposing an external drive would do the trick? And what should I back
up? All bytes on the current hard drive i.e. a mirror of the entire drive?
Is that practical?

Is there a way, I can program to plug in the external drive every so often
and it will automatically update what is changed?

Or do I just move file by file like copying to a floppy?

Any thoughts would be appreciated.

Fred



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