Windows 2008 STD and Windows 2008 R2 STD built in backup differences

I am setting up a full backup using the built in Windows 2008 backup on our servers. Some of our servers are the 2008 R2 flavor and some are just 2008. The R2 versions show that the full backup is bare metal in the description. The non R2 version do not say anything about bare metal in the description. Is the bare metal feature not supported in 2008 (non-R2)?
I would appreciate anyones clarification
Thanks,
Chris