If you have already created backups of this server using Windows Server Backup, you might lose access to them if you do not ...

If you have already created backups of this server using Windows Server 
Backup, you might lose access to them if you do not recover the catalog 
first. Do you want to continue without recovering the catalog?

Select C if this is the first backup of this server or if you do not need to 
access earlier backups. 

Select E if you have already created backups of this server and want to 
recover the catalog for those backups before you continue. To recover the 
catalog and access the earlier backups, at a command prompt, type the 
following, where  is the location containing latest backup 
of the server: 

WBADMIN RESTORE CATALOG -backuptarget:.

[C] Continue [E] Exit %0