How can I backup & restore Opera for Android, especially open tabs?

This is the first time that I have a non-rooted device (because people rooting their phone are cheaters, bankrobbers and media pirates according to many app publishers and they refuse app usage on rooted devices) and now I have > 100 open tabs and had to notice that opera does not allow adb backup.

I would really prefer not to use any cloud service like google drive, as I don't want any hoster to know my open tabs.