You shouldn’t be creating new snapshots on a backup target. This will cause breakages.
When asking for help with these types of situations, you’ll have to split up your post into sections with clear layouts and relevant information.
I know it seems self explanatory to you (since you are sitting in front of your server/GUI), but it’s hard to follow.
I know there are three pools on your TrueNAS SCALE server:
- default
- software
- backup
I think you’ve successfully replicated the root datasets of the pools “default” and “software” into your backup pool, nested like this:
- backup/replicas/default
- backup/replicas/software
Within each of these exist all the children (and the replicated snapshots).
Is everything encrypted with these “replicated root datasets”, including their children?
Is backup/replicas encrypted?
How did you configure the Replication Task to go from backup/replicas → Ubuntu?