I don't know much about One Drive. (I had to use it years ago.) But I wonder if this is what you really want? Your use of the word "Back-up" makes me unsure.
First off, iCloud is not a backup service, it's a synchronization service. The purpose of iCloud is to keep your files exactly the same among all your devices. If you make mistakes in editing your files, those mistakes will be immediately copied to iCloud when you save. If you accidentally delete a file on your Mac's iCloud Drive folder, then it will be deleted everywhere, and immediately! If you spell a client's name wrong, it will be misspelled everywhere.
If you're after a backup, then you need copies that are not synchronized. Most of us, when you make a terrible mistake in our work, want to be able to go to our backup, and restore the file to the way it was before we made the mistake. That is not iCloud! Backup is what Time Machine is designed for-- do you use that?
I'm not sure about One Drive, but I am sure that I don't need two synchronization services. I use iCloud's synchronization service, and I back up my work with Time Machine. People who use Cloud backups (not iCloud) copy their stuff to an off site storage place at certain times, and keep more than one copy.
Anyway-- I hope this makes some sense in the use of iCloud.
(I copied some of this from: Understanding iCloud Drive - Apple Community )
