Archiving of CO-objects - transaction SARA

Hello,

we use the new G/L and we want to archive CO-data.

I have some questions here:

a) concerning archiving object COPA1_xxxx (costing based copa, xxxx is the operating concern):
    What does the system archive under this object.
b) COPA2_xxxx refers to the account-based copa. We do not use the account-based copa.
    Is it correct that I need not archive anything here because we do not use it? I assume I am right.

c) CO_TOTL_AO is the object for CO Totals Records for Reconciliation Objects.
    Does it refer to environments which go for the classic G/L and not for the new G/L?

I also  ran the reports RARCCOA1 and -2 but these programs only refer to CO-objects and not to CO-PA.
Are there also transactions which help analyse the CO-PA objects for archiving?

Thanks a lot for any input.

Thomas