Cannot Back Up. The Storage Account You Are Trying To Back Up Is in the Restore Only Mode (code 1402)

Situation

A backup plan terminates with the following error: Cannot back up. The storage account you are trying to back up is in the restiore only mode

Cause

The storage account has been switched to restore-only mode. This mode restricts any uploads to storage.

Solution

Switch the backup mode to regular.

1. Right-click the required storage account, then select Edit Account, or, in the application menu, click Edit Storage accounts.

2. Click Advanced Settings.
3. In the Advanced Settings property box, select the Regular mode: back up and restore option.

4. Specify the backup prefix.
5. Click OK.
6. Restart your backup plan.