What do I need to make reg back up of files?

I have a laptop with an ever decreasing hard drive capacity, so have bought an external hard drive. However, so far I have just copied files (pics/ docs etc) to the hardrive, which is a pain as I don't know which files are "new" or have been updated and so some material is saved over and over again (I tend to just transfer my entire "My Documents over every so often!!).
Is there a way of regularly saving files to the external hard drive so that only new or changed files are saved? If I have to buy software that's ok although free is better :)

P.S Forgot to add, I'm running Windows XP!

  rawprawn 08:45 13 Jul 08

Acronis True Image 11
click here

  rawprawn 08:46 13 Jul 08

Or you can get the previous version whichwould be no problem at all for you.
click here

Thanks it looks ideal- does it solve the problem of backing up files that have been altered or are new only?

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