That isn't going to help. It is his broadband and hence his wifi that is only running at 2.6mb, not his cellular service.

Also, I don't think there is an option there to turn off cellular usage for iCloud.

Further, iCloud drive isn't what is used for iCloud backup.

And finally, iCloud backup only runs over wifi anyway, it won't backup when it is only on cellular.

wink
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Remind me to change my signature to something more interesting someday