Specifically this is the piece I am looking for guidance on:
Pick one that has features and costs acceptable to you/client.
I mentioned three product solutions that I have explored or tried, Azure, SkyDrive and Carbonite, and all have pluses and minuses.
Just to reiterate, to open it back up for discussion:
Are people using one of the three solutions mentioned above with success? What else are people using?
There are no special teachers of virtue, because virtue is taught by the whole community.
--Plato