If you have forgotten your current encryption key, you can proceed anyway and force a reset to the new key.

To protect your backups from an unauthorized user changing the Encryption Key, backups to your Offsite Locations / Network Shares will be disabled until you re-authenticate them from the Backup Locations screen. 

Once you have entered the Windows credentials to change the Encryption Key; here's how to re-authenticate to your Backup Locations:

1. Head over to the [Setup] > [Backup Locations]
   
   You will see something similar to the below disconnected backup locations:
   
   
   
   
2. In order to re-authenticate your Backup Locations, you can click on the [Edit] (pencil icon) for each of your locations:
   
   
   
   Network Paths
   
   You will be required to enter the Domain/Machine, Username and Password. Once entered, click [Test Connection] and [Finish]
   
   
   Azure Storage Account
   
   You will need to re-enter the Connection String, which you can get from your Azure portal account. Click [Modify] and enter the Connection String, click [Test Connection] and [Finish]
   
   
   Amazon S3
   
   You will need to re-enter the Region, Access Key and Secret Access Key which you can get from your Amazon S3 account. Once entered, click [Test Connection] and [Finish]
   
   
   Wasabi Cloud Storage Account
   
   You will need to re-enter the Region, Access Key and Secret Access Key which you can get from your Wasabi account. Once entered, click [Test Connection] and [Finish]
   
   
   Offsite Backup Server
   
   You will be required to enter the VM Backup Username and Password. Once entered, click [Test Connection] and [Finish]
   
   
   Offsite Backup Server [CP Managed by an MSP]
   
   Contact our support team for help to re-authenticate.