backup exec 2012 backup and restore tab

A few very basic questions relating to backup exec 2012:

1) On the backup and restore tab - how accurate is the data held with the last backup column

2) How do servers appear in the backup and restore tab in the BE 2012 console, i.e. how do you register a new server in backup exec? Or is it doing an inventory of your network and reporting the status of all servers - or just those "registered in BE?"