Stop "Backup this document" prompt in Office

Its such a malicious, selfish and annoying design.
My 70 year old mother does not like saving in one drive.
She has local documents and she knows and understands this fully and safely.

I've given her a simple routine using an external drive which she is fastidious about using. Nothing she has is that 'essential' once she created the document and emailed it.

There should be a way to turn of just this specific feature alone.

The other day she was really distraught at losing a tax document she'd spent all the previous day doing. I was engaged so she had to drive all the way over to me so I could try and sort it out in my break.

Lo! and Behold! It was rerouted to her onedrive and not her documents which she understands and has used for 10+ years now.

With everything else that's going on with MS products at the moment, I call a pox on the MS design team and all their lineage!
They care nothing for the very real pain they are putting the people who use their software monopoly through, and they are only interested in their own selfish agenda, which is furthering their monopoly.

May the orifices of them and their lineage be afflicted with a terrible pestilence, I say!