Hi Gordon,
In regard to the issue, as @Kevin has pointed out, currently it’s not available to do this in P plan(Office 365 for Professional and Small Business subscription). I suggest you try the solution provided by @Kevin, to use SkyDrive to sync your data to the cloud, for more details, you can post a new thread in our SkyDrive forum via Microsoft account, Hotmail, SkyDrive Forum.
If you have any good ideas about how to improve our products, you’re very welcome to submit them to us by click “Feedback” in the lower right of our community or via Email Feedback, your time and efforts will be highly appreciated.
@Kevin, we appreciate your valuable info and efforts here.