On the Backup and Restore screen in the Mirra application,
- Click New backup on the Backup Tasks menu.
- Select a folder to back up from the Browse for folder window and click OK.
- Click OK in the Confirm Backup Creation window.
You can also select a folder for backup by right-clicking on the folder in Windows Explorer or Control-clicking on the folder in Finder and selecting Add to Mirra Backups on the dropdown menu.