I agree for cold storage, and there are a remarkable number of ways to do it. I’m less sure of archive.
What storage is that? Put your archive data on ice with new storage offering is Google Cloud Storage.
the Archive class provides almost instantaneous (milliseconds) access to your data when needed. Access and management is performed through the same consistent set of APIs used by our other Cloud Storage classes, with full integration into Object Lifecycle Management. You get the same experience as our hot storage options
which at least for access sounds less awful for Duplicati than archives that need lots of work and time.
Amazon S3 does have a programmatic way to unfreeze cold archives, but Duplicati doesn’t support it.
I don’t use Google Cloud Storage, so might be wrong, but it’s sometimes seemed like more of a billing consideration based on the intended access pattern than a technical hurt . See Cloud Storage pricing.
Note that Duplicati by default does do sampled file download verification, and if you have space churn, compacting will do additional downloads and uploads that will cost more if you go with archive class…
While looking at just the storage cost makes such things look cheap, look at the rest of pricing picture.
Also consider how hard you want to work to learn and administrator. Enterprises may have specialists.