There are multiple options for recovering data where no network connectivity please refer to section 2.5.5 of the service definition:

The Customer’s remote agent console interface allows the authorised Customer network administrator to quickly and easily select and restore data. Data can be restored to a remote system; for example, the administrator could use their desktop machine to restore data to a remote server. Multiple restore operations to separate servers can be performed from a Customer remote agent console making this particularly suitable for a help desk role.
There are four methods in which data can be restored:

1. Online restore, where data is restored across the internet or service connection.
2. Restore of data is made available at the Redcentric datacentre via a portable disk drive.
3. Major disaster recovery, involving a portable MBS vault being delivered to the Customer’s site or alternative disaster recovery location.
4. Recovery of data directly to a Customer server hosted in the Redcentric datacentre.

You can read the full Service Definition below:

Managed Backup Service Definition