Downloading the OS

I use a 17" Macbook Pro. I am waiting for a 256gig SSD. I currently use 10.6.8 but want to buy and download 10.8.2 and install it on the SSD as a test before I install the SSD in the MBP. What if something happens and I have to reinstall the OS.  Can I keep downloading and reinstalling. If I bought the OS on DVD I install all I want. How does this work with the App store. Will I have to pay $20 each time I download. Thanks for any enlightenment.

Can I keep downloading and reinstalling.
Yes.
Will I have to pay $20 each time I download.
No.

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