OneDrive is a legitimate cloud backup service that a lot of people should actually use.
I see users lose data all the time. They never backup and they never will. OneDrive solves that.
For an extra $2 a month OneDrive will even do at rest encryption. If you are broke you can use Boxcryptor for free (to do at rest encryption) if you are a non-commercial entity.
https://www.boxcryptor.com/en/onedriveIMO at rest encryption should have been there by default, but I still recommend users take advantage of OneDrive whether they bother to go the extra step or not.
I tell users not to use an MS account too, though some may prefer it - and that's okay.