OS X Mountain Lion: Time Machine options preferences
Use Time Machine options preferences to specify any items you want to exclude from backups, and other options.
| Option | Description |
|---|---|
| Add (+) |
To exclude items from backups, click Add (+), select the items, and then click Exclude. |
| Remove (-) |
To remove an item from the list, select it, and then click Remove (-). The item will be included in the next Time Machine backup. |
| Back up while on battery power (portable computers only) |
To have Time Machine create backups every hour even if your computer is on battery power, select this checkbox. Deselect it if you wish to conserve your battery. |
| Notify after old backups are deleted |
If your backup disk becomes full, Time Machine creates space for new backups by deleting old ones. To see a message when Time Machine deletes old backups, select this checkbox. |