Exchange 2013 and 2010 use recovery databases. Each server has a recovery database and there can’t be more than one mounted recovery database at a time.
Once the recovery database has been created, you first restore the backup to it and then use the Microsoft Exchange Management Shell to extract mailbox data from the information store into the local mail.pst file. You may also opt to merge the extracted data back into the currently active information store.
Recovery databases are fundamentally different than the RSG (Recovery Storage Group) mechanism used in Exchange 2007 and 2003.