Backups are not created on an external storage

If the platform's public SSH key is not specified on the external storage, VM backups will not be written to that storage. To check the key:

1. Connect to the server with the platform via SSH.
2. Get the public key:
   

   docker exec -it vm_box curl -k -X GET -H 'internal-auth: on' -H 'Service: vm' -H 'Content-Type: application/json' 'http://input:1500/vault/v4/value/ssh_pub'

3. Copy or save the public platform key.
4. Connect to the external storage via SSH. Use the login and port specified in the storage connection settings.
5. Check the contents of the public key in the ~/.ssh/authorized_keys file.
6. If the content of the key does not match the platform's public key, delete the wrong key and add the correct one.