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Retaining validator keys when wiping node data

To backup your validator keys (located in priv_validator_key.json & register.json), make sure you're running AccMan v0.3 or above.
Your node should be running.
Select Key Management.
Select Backup Key to AccMan. Follow the prompt to encrypt it with a password.
Take note of the Network. YOU MUST ONLY RESTART ON THIS NETWORK / BVN later on
Stop the node.
Delete Node with the “Clean/Delete” option.
Create node
Join Accumulate Network
Select the same Network as your backup
Select the same BVN as your backup
Select latest version offered.
Restore key when prompted