Wholehog 3 and Road Hog as Backup?

So a couple questions can I use a road hog as a backup to a hog 3 using a DP 2000 assuming both have the same software 3.1.9?

If not can I use a road hog as a back to a hog 3 using a dp8000 using software 3.1.9?

And with 3.1.9 can I use a a USB flash drive to backup both the wholehog 3 and the road hog?
Related