ahhhh another day, another new previously undiscovered reason to love virtualmin pro. i could get used to this really fast.
i see virtualmin pro currently supports the following "cloud storage providers":
amazon rackspace google-cloud dropbox
what might be involved in supporting iDrive? they seem to have the best prices, something like a terabyte for $40 a year.
i did find this: https://www.idrive.com/cmd_steps
it appears there is indeed a linux CLI available.