Future Proof your SOC with the Power of the Azure Ecosystem and Defender Threat Intelligence

If a group is satisfied with cost related to ingest into Sentinel with the included 90 days of retention but wants longer term storage, like 1 year, how would they leverage ADX for that?  How would you export Sentinel logs, just prior to them dropping due to retention limits, into ADX? 

Or would it just make more sense to retain them via Azure Monitor that is part of Sentinel?  In that case I am assuming that this ADX solution is really about limiting ingest charges on the front end and less about the retention cost?