I adapted the backup batch file that Steve wrote in this thread. I used Notepad to write it on my PC then saved it as a .bat file on the BRIX desktop. I made the BRIX desktop a shortcut on my PC desktop so I can easily drop stuff into it.
I double click on the batch file icon from the iPad in WRD. I could automate it, but again I think that might mess with AO.
I think taskkill might be a fairly unfriendly way to close Roon, however, and a cleaner shutdown command we can implement from a command line is under development by Roon.
I only backup the database rather than the whole Roon Server folder and I write it to a USB stick hanging off the BRIX.