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I manually backup my home directory onto an external USB drive.

So far, I have to override everything data on each backup which, of course, results in long back up times.

Is there a free and simple tool that I can use to sync folders?

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up vote 2 down vote accepted

On 10.7 Finder now suggest merging folders when you copy and paste over an existing folder:

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This is great! I should have seen this before. But because I this is always done in a hassle, I did not notice. Thank you. – mathew Dec 27 '11 at 8:05

Unison or SuperDuper! are two apps that make doing sync-style updates easy.Time Machine automatically does sync-style updates, but also does versioning.

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