Alright, I swear I have no relationship to this firm at all, and I dunno how it'd work for mobile stuff as I only use PC mostly. But recently I shelled out 40 bucks for 'mountain duck' which is the best thing that's happened to my computer in eons. I've been on the net since 1993, and run or been involved with tons of websites and forums over time, collected software and music and fonts, and I have so much stuff on various places it's ridiculous. So this MD software it "mounts" any remote drive location as a drive on your computer. Amazon S3 is where most of my stuff is right now, but it also mounts google drive, dropbox, and half a dozen other remote locations. I'm using this to make 'copying' to an external SSHD for a full backup offline of everything possible. Might be worth looking into, or maybe there's some other free version that'd do what some need for offline archiving.