said by Nightfall:
I didn't see a data cap. Please link to your source.
Note I said Unless, However at the end of the press release read the fine print...
Requires compatible iPhone 3GS or higher or Android 2.1 or higher smartphone, or internet access from computer. You must enable the Easy Upload feature in order for your content to be automatically uploaded to the AT&T cloud.
"""" Download and usage from wireless device may consume data.""""
Service intended for US based customers only. For terms, see att.com/wirelesslegal. )
Now Theres no mention that this will NOT count against your data it only mention that it MAY consume data. In those worded terms on there wireless network and not over wifi I speculate it will count.