Hello,
this post shall not be any advertising, but just a hint for those of you, which are looking for cloud storage providers that support ZFS replication.
The Hetzner Storage Box (Hetzner is a provider in Germany) seems to be a relatively cheap (3.81 EUR per 1 TB; 12.97 EUR per 5 TB per month) cloud storage solution and they provide a lot of different protocols to upload/download the data. In the background they use ZFS for the storage (you can use the .zfs/snapshots folder).
I contacted Hetzner if ZFS replication is also supported. The answer was that this feature is not available, yet, but a feature request was already created and they marked this feature request with “+1” because of my request.
So, if anyone from you already thought about using a Hetzner Storage Box, it could be helpful to get some more “+1” on this feature request 