It's even more important that you back up your encryption keys when using the new dataset encryption. Keys are stored in the database and are regularly cleaned up. It's a lot easier to lose them compared to legacy encryption, which never deleted keyfiles from /data/geli/.
Now, keys are deleted when you export a pool. This might actually be desirable, but it is different than before. Renaming an encrypted dataset will also result in the key being deleted during the next sync.
Now, keys are deleted when you export a pool. This might actually be desirable, but it is different than before. Renaming an encrypted dataset will also result in the key being deleted during the next sync.