0 - 2 of 2 tags for cluster online

Hello,
Tables with fallback protection ensures that copy of each row is available on fallback AMPs in the same CLUSTER. I have few questions on this.
1) How do i identify that what all AMPs are the part of same cluster. 
2) Is there any console utility in teradata to check the AMPs which are grouped together?

Has anyone tried this feature in TD12 or TD13?

I would like to know how it does online backup. Do the inserts/updates are commited while the backup is in progress?
Does it use Transient Journal? Teradata manual on backup has below information.
I am looking for more technical information on how online backup is done.

"When online archive is initiated on either a table or a database, the
system creates and maintains either a log for the specified table or a
separate log for each table in the specified database. All changes to a