Backups in iOS don’t backup files in and individual way. Everything is saved in one big lump that can only be restored as a whole. You can restore your entire iPad, but not a single document. And it only works for content stored on your iPad.
I don’t know how or if iCloud is backed up. It is not something you get control off. I’m pretty sure Apple keeps backups of some kind for their iCloud servers, and they can restore them, but it’s not a customer facing option. You would have to work with tech support to get it done. I did this once, around 2011 or 2012 when my iCloud content all disappear, but it felt like the support person working with me did not have a standard instruction on how to do it. More like he had to put in a request with some other department. No idea if it’s still an option.
Still, the backup process or state should have nothing to do with what you are doing, After all, you have the option of turning it off, and that shouldn’t change whaat can or can’t be done outside of restoring.