Do iPhone Safari tabs restore from a backup?

I was having an issue with my iPhone and support told me to factory reset the iPhone and restore a backup from this morning. I did, all is decently well, however; when I went into Safari, all of my opened tabs were gone. My safari history is blank; when I go into the advanced settings I can see that most of the website data says 0 bytes. In my iCloud settings Safari is, and was, toggled 'on.'

I chatted with a support Advisor who suggested turning Safari off in my iCloud settings, waiting a few minutes, turning it back on. I did this and it restored only some of the tabs– some new, some old.

Is there a way to restore ALL of the tabs? If I'm restoring my phone to a backup from this morning, I just assumed that the tabs would be part of that; seeing how I also have the iCloud setting on. And if they can't be restored–which I think would be insane; why wouldn't they warn you about that, or why wouldn't tabs and history be saved and restored like everything else?–then how do I prevent this in the future? I'll get a new iPhone at some point, will need to wipe the old and restore the new using a backup. I have hundreds of tabs for work– going through and bookmarking each one seems crazy.

Thanks!