The Backup/Restore service stores the following components:

• User settings from the settings app (excluding wifi passwords),
• Profile data
• Application data (not the applications themselves)
• The files will be zipped and encrypted 

Backup Your Device

1. Go to Settings
2. Click on System
3. Then chose backup on the left menu

Restore Your Device From a Backup

1. Go to Settings
2. Click on System
3. Then chose backup on the left menu
4. Pick a restore point