If this is a critical need for a business, you maybe should think about using an enterprise cloud backup solution, not just a consumer file sync and share tool.
Agreed with djdavetrouble... don't use consumer services for business. Get something with a SLA and support clauses when your needs are "critical".
@djdavetrouble @Taylor.Armstrong thanks guys. I'll look into it. Any chance you have used or come across any decent solutions?
@kowsar.ahmed you may want to escalate this as a feature request to your Apple sales team. I'm sure you're not alone in wanting the ability to use managed distribution (as you do currently for books & macOS & iOS apps) to allocate expanded iCloud storage to users.
After attending an Apple event recently, I asked the same question and they said there is something in the pipe works for managed Apple ID's etc