Update folder - old versions of concrete 5

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Hi,

I am about to update a website from 5.6.0.2 to 5.6.1, so I started to back-up all my files. about 10.000 for a small website. And I saw there were a lot of files in the update folder because there is version 5.6.0.1 an 5.6.0.2. I couldn't find a clear answer.

So my question:
Can I delete 5.6.0.1 without any problems? And after installing 5.6.1 I like to delete 5.6.0.2. Will this cause any problems?

Thanks,

Maarten