Cloud Backup : How do I Control Which Files will be Backed Up? : Modifying Backup and Exclude Sets
  
Modifying Backup and Exclude Sets
1 In the Configuration pane, click Cloud Backup > Backup Sets or Cloud Backup > Exclude Sets.
2 In the Backup Sets / Exclude Sets window, click on the backup or seclude set that you want to modify.
The Backup Set Details window is displayed.
3 Follow the wizard to modify the set in the same manner as you would create a new one.
For detailed instructions, see Creating Backup and Exclude Sets.