Well - I am actually doing a backup right now of my MN but - I don't think my [.img] file will do you much good as I gave moocowmoo
access to my Pi a few months back. He added some "special" software to it that makes this MN 'idiot-proof'. BUT, I don't think you could us it just as a NODE and I could be wrong. Maybe Moocowmoo will chime in with his thoughts on this matter....
IF I was to send it to you - there would be a few things to consider
I changed the ssh port - no longer 22 - as I hate defaults and big believer in altering certain said defaults to increase security, at the least
This software will try to restart your MN every 2 minutes :-D VERY cool stuff - if not currently running - NOT a cron job -
DEBUG file has been turned off - to keep the overall size of the 'info/data' on the SD card to a minimum
You could try a 32GB card but you might need a 64GB - depends of the actual size [number of actual 'usable blocks' on the card] of your current SD card
You'll want to change the password on the card - of course - I don't use the current password on anything else so - not to worried there
I don't know how nerdy you are so...... BUT we could always do a Google Hangout, at some point - if need be....
Let's see what Moocowmoo thinks.... just to be safe and sure
I have a lot to do today - day off - but I'll be in and out all day
edit: if you was to stick the SD card [.img] into your Pi and connect it to the net - you'd be running my COLD-side MN with ZERO effort needed to get it started - this thing runs better than the Energizer Bunny