There’s been some discussions around how to migrate from GELI encryption.
GELI encryption stopped with TrueNAS 12.0 in 2020. Old pools were still operable, but new pools could not be created. New pools use ZFS encryption which is faster and more powerful. You can replicate encrypted data without exposing it. You can also lock datasets.
There is advice on new and old forums for migrating back from GELI.
