[mattrad]

There is an alternative to managewp.com: https://wpremote.com/ (not affiliated, etc.)

It's free, and UK-based - so benefits from EU data protection. By @humanmadeltd.

EDIT: Running on EC2 AFAIK, so subject to Safe Harbor, FWIW.

[jakeonthemove]

And again, out of the user's real control... Sure, the security seems sound, but you still put all your eggs in someone else's basket, so to say, with any such cloud service.