I've already posted this a few times but just use DSU sideloader to boot a prerooted GSI then use Partitions Backup and Restore app from playstore to save copies on your device. Install magisk app and patch the extracted boot.img and then transfer backups along with the patched boot image to your PC for safekeeping and flash the patched boot.img in fastboot. You can rename any .bin files to .img to flash them if they get extracted as a .bin file. Check your settings in the partitions Backup and Restore app before starting the backup process. You can choose to save them in an easy to find directory and for me it was better to choose to save them RAW/uncompressed then just compress them all into a single archive rather than having a hundred separate archives for each individual partition because it makes it easier if you have to reflash things if you need to recover. You may want to disable battery optimization for the app because it takes a while to extract all the images doing a full backup but its well worth the wait time if it saves you from a brick later on
I've already posted this a few times but just use DSU sideloader to boot a prerooted GSI then use Partitions Backup and Restore app from playstore to save copies on your device. Install magisk app and patch the extracted boot.img and then transfer backups along with the patched boot image to your PC for safekeeping and flash the patched boot.img in fastboot. You can rename any .bin files to .img to flash them if they get extracted as a .bin file. Check your settings in the partitions Backup and Restore app before starting the backup process. You can choose to save them in an easy to find directory and for me it was better to choose to save them RAW/uncompressed then just compress them all into a single archive rather than having a hundred separate archives for each individual partition because it makes it easier if you have to reflash things if you need to recover. You may want to disable battery optimization for the app because it takes a while to extract all the images doing a full backup but its well worth the wait time if it saves you from a brick later on
