[FastRX8]

Yes, it's a complete copy of what you have on your phone now.

Example -
You have a stock sprint rom, not rooted, Radio 1.32.651.1, every sound customized, 4 email accounts, 10 apps you installed, and some crazy wallpaper w/ a fat purple cat.
So you make a nandroid backup.

Then you decide to full-root your phone and install OMJ's latest rom 1.6r which has the new OTA included and the latest Radio 2.05.00.06.10.

Then, you decide you don't like it, so you do a nandroid restore.
You will be back at a stock sprint rom, not rooted, Radio 2.05.00.06.10, every sound customized, 4 email accounts, 10 apps you installed, and some crazy wallpaper w/ a fat purple cat. (notice the radio did not get restored)


Basically, it will revert back to whatever was on the backup. Keep in mind that it does not reverse the affects of the latest OTA that prevent you from rooting the phone. If someone did the OTA recently, restoring a nandroid backup won't undo that.

Edit - I fixed my post. Winmonewbie told me he didn't think the radio restored. I justed tested it by restoring an old rom and it did not affect the radio. Thanks winmo.