Hi Yakano,
Maybe this can work for a personal address book .. for sample.
But it's NOT suitable for MULTIUSER/MULTIACCESS record locking.
You see:
30ms ping + platform (google drive/one drive/dropbox) user autentication per access + Slowishhh HTTP/S protocol overhead .... while in a typical hard disk we get less than < 3 ms instantaneous access.
Regards,
Antonio Lima