Not sure if this assists, it is a good explanation from Ben. I have no intention of installing GPS on my graphene os Pixel, and was not sure how this affects the Magic backup. I asked the question in the Envoy category
The 2 files you want to securely backup in addition to the 2 NFC cards and the envoy seed shamir backup is: envoy_backup.mla.txt (all the metadata for any subaccounts and 2FA, etc..) and settings.tar which is the full backup of your master seed. The 2 files cover everything.