Carbonite has expanded its online backup service to support Mac systems. Individual users or small businesses can automatically back up an unlimited amount of data. The software runs in the background, continually copying new or changed files to the company's servers. Data is encrypted when it leaves the local computer, where it is then transferred to the secure data centers using the SSL protocol.

Users can check the status and settings of the backup operations through a preference pane. Colored dots indicate which files are included in the backup. If a file or folder needs restored, copies can be transferred into the original locations, the desktop or another location. Customers can also log into their account from remote computers to access backup files.

Bandwidth usage is automatically adjusted to prevent interference with the user's activities. For networks sharing one Internet connection, a low-priority mode can be used to further protect against lag.

Carbonite Online Backup requires Mac OS X 10.4 or higher, and can be downloaded directly from the company. The subscription costs $55 per year, while a free trial is also available.