Opera Link is the tech where your bookmarks and quick-launch sites are synchronized to the Opera servers.
While you can get everything saved in a backup, if you boot without one, or on another nomadic TC system, it's just a matter of clicking File -> Synchronize Opera, typing in your username and password, and getting access to bookmarks and quicklaunch buttons.
This sometimes comes in handy for me.
To use it requires an Opera account, which also gives access to their forums, and if desired, blog space and other things.