Hello!
I installed loraserver3.0.1, lora-app-server3.0.0, lora-gateway-bridge3.0.1 on the stretch, configured device-profile to abp, added an abp device and configured Device address, Network Sessionh key and Application Session key.
After finishing the above, I backed up the entire SD card and burned it to another new SD card. After inserting the new SD card into the Raspberry Pi, I found that the Device address, Network Sessionh key and Application Session key were all empty. I think that after the SD card backup is restored, it should also have complete data.