OneDrive is absurdly easy to not use. I feel confident saying that if you can’t figure out how to save an MS word file to a non-onedrive folder you should definitely leave it on. A single backup on a cloud service with a local cache is better than a single backup on one physical drive that will eventually fail.

If it’s important, you want at least three backups in two different formats with one physically removed from the others. A copy you save to a thumb stick, a copy you save to OneDrive, and one you print out. (Or, conversely, the physical copy you bought, one electronic copy local, and one copy of that electronic version saved to iCloud or what have you.)