Hi:
Overall it seems you want to archive a set of files on a daily basis and
then store them offsite. I assume you want to archive rather than simply
backup  because you want to retain each version of the file for a long
period of time.

How you would go about it depends on your situation. For example, if you
know you want all archived files from all clients to be retained for five
years, then you would have a single copygroup  archive definition defined
for the default management class and the destination going to a specific
storage pool to isolate the archives from the backups. Then you would
checkout the newly created volumes in that (archive) storage pool.