As far as I know, ADK is the standard way to do BW archiving, the data which has been archived will be deleted from the infoprovder. You have to re-load them from flat file if you need them in the query.
for the NLS method, the data can be shown in the query without re-loading process.
My question will be :
how to implement NLS archiving and is there any requirement for it?
thank you in advance.