When you have a disaster on your server and you have lost your data, if you didn't enable the JB config backup feature or have lost the Master Encryption Key, you can still restore your accounts from your backup destination.
In order to restore it, you will have to go through a few steps:
After the JetBackup installation is over, go to the JetBackup Dashboard and you will see the Disaster Recovery page.
Click on New Installation.
NOTE: When perforning Disaster Recovery without the Master Encryption Key, you will be limited to exclusively restoring from read-only destinations. All previous JetBackup Configurations (Destinations, Backup Jobs, etc.) will not be restored and JetBackup will not be able to continue backups from where it left off. This means that JetBackup will have to start generating new backups from scratch. To see how to perform a standard Disaster Recovery, visit Recover from Disaster
If the path is set correctly this should index all your snapshots.
Go to Jetbackup -> Restore&Download and select 'orphan accounts' option on the Accounts Type.
Select the accounts and restore.