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Then, back up the "Bookmarks" and "BookmarksExtras" files. Now, another way to back up and restore your bookmarks that works better is to goto the URL opera://about and take note of the "profile" path.
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Then, after you import your bookmarks, you can just right-click on that speed dial folder and choose "open all in tabs" to open all your pages back up. Then, when you export your bookmarks (via the drop-down on at the URL opera://bookmarks, it'll export your speed dials and that folder too as speed dials are just bookmarks in the "speed dial" folder.
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For your opened tabs, you can right-click on one of the tabs in the tab bar or the tab bar itself and choose "save all tabs as a speed dial folder".
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