Currently, there is no option for "Local only" restore from a USB made in the Managed Backup Service (it's already on our roadmap).

The reason is that first there is an attempt to sync the cloud accounts that you have in MBS and to do that we require the credentials to the storage, which are not stored locally - they are retrieved from MBS. So it's trying to get you all the locations the data can be in.

In Standalone software, the credentials are stored locally so there is no need to retrieve them for the sync. This is the main difference, plus the option to manually remove any storage account, so for now, you can use Bootable USB created in a standalone product to workaround.