hello akudo,
actually, you may using backup/restore script after secure boot has enabled.
for instance,
$ sudo ./tools/backup_restore/l4t_backup_restore.sh -u <PKC> -v <SBK> -b <Jetson-platform>
however,
there’s security concern to backup/restore an encrypted disk, (i.e. ROOTFS_ENC).
please refer to Topic 291335 to create encrypted images with a generic key,
so that you may create a massflash (i.e. mfi_*.tar.gz) package to flash multiple devices simultaneously.