anonymous user Yes, for FR a new resource is provisioned in a new region under which the model will be registered. The disaster recovery scenario for form recognizer ensures models are copied to a different region for backup purposes using the copy API. The guidance in this scenario does not distinguish between prod and non-prod versions, as from the copy API perspective the copied model is just registered under a different resource which can be used in the event of any disaster to original model id.
With regards to storage used for training, storage accounts already come with many data redundancy and backup options. In my view the backup options for Azure storage accounts should suffice and you can still use the same storage account for training new form recognizer resource by just changing the storage connection SAS URI.