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Brainstorming here.
* REPLICATE NODE probably would not be the right target for this. It would either need new tables with duplicate data that could get out of sync, or it would need to scan all objects and cross-reference them, which would slow down performance is a big way.
* Legacy "BACKUP STGPOOL" would do what you need, but there are a lot of filespace locks, and scalability issues.
* Container's "PROTECT STGPOOL" would do some of what you want, but it only does raw blocks, not pointers. Also, it's currently limited in target storage.
* An improvement to cloud tiering / DEFINE STGRULE that copied instead of migrated the data might get you closer. This would probably benefit a lot of other RFEs and long term design goals with less effort.
I'm not with IBM. I'm just interested in your RFE. Hopefully, IBM will reach out and get more details from you that would help tailor their targets to help you.