My nandroid backups are closer to ~215mb, but I had a few apps installed. The /system image is about 150mb alone, so I'd say at least 250mb is a safer bet.
Probably the easiest thing to do is move all your SD card data off to a folder on your PC, do a Nandroid backup on the empty card, copy that to your PC and then copy back everything that was on the card originally when you're done playing.
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