James, there's actually no need to re-create jobs anew. You can continue using your existing replication jobs without any issues. Replication jobs newly created on v8 will store restore points as VM checkpoints
, which allows for faster recovery to any replica restore point, better reliability and the ability to power on any required restore point manually if required. However jobs created in previous versions can still be utilized.
If you still want to "upgrade" replication jobs to the new format, you can re-create them and map to existing replica VMs, to avoid transfer of full VM data.