Windows Live OneCare Backup starts a new backup collection (All of the backed-up files and associated data that Windows Live OneCare has stored for a computer in a given time period (usually a year), contained either on several backup discs or in a folder on an external hard drive. A backup collection is identified by the backup collection name, which contains the computer's name and the year.
) and performs a new full backup of your files once a year. The default yearly backup takes place automatically the first time that Backup runs after the new year. The yearly backup helps to make sure that your backup collection is complete and up-to-date.
You can also choose to run a full backup at any time by selecting Perform a new full backup, or change my backup device on the second page of the Backup Wizard.