I always felt a bit unhappy about not being able to backup my SD cards of the G1000 and in fact, Garmin did not allow it or did make it a bit difficult with the older databases I happily used although expired
The good news is that Garmin has improved its safety measures and it seems that they are no more concerned that someone could use a backup to share it with his buddies.
Bad news is that you will have to create the backup SD card from scratch and you cannot backup your currently installed databases if they are expired or if you don't have access to the Garmin account where they were created. Especially buyers of used Diamonds with G1000 should make sure to get a decent backup made by the seller if they can't take over the Garmin account.
Btw, this here is not a hack, trick, exploit or crack but a simple and fully legal Garmin procedure.
Here is how it worked for me:
1. login at https://fly.garmin.com/fly-garmin/
2. select "Aircraft" from the horizontal menu bar
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3. select the database you have already purchased and would like to restore
garminselectdatabase.png [ 62.19 KiB | Viewed 4183 times ]
4. click on "Install..."
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5. now it looks like you had to install the GARMIN communicator plugin or so. You don't have to. Personally, I like to keep things simple and I don't know what it does. So just click on the alternative download on the right hand side, see arrow in screenshot.
garmincommunicatorplugin.png [ 67.54 KiB | Viewed 4183 times ]
6. You will now see the actual download link. Download and save to a safe location. Also copy and paste the unlock code and system ID to a textfile or so and save to a safe location.
garmindownload.png [ 71.8 KiB | Viewed 4183 times ]
7. Have as many new SD cards ready as you want to produce and stick the first one into your PC's SD slot. Run the downloaded executable file and enter the codes when prompted to do so.
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You can now theoretically produce as many SD cards as you want to simply hitting the "Program Device" button each time you inserted a new SD card.