On-device Stage 1.
#Make partitions backups.
devel-su
/bin/dd if=/dev/mmcblk0p2 of=/home/user/MyDocs/rootfs_backup.img
#will create 4GB rootfs backup image. No progress will be showed. Wait for procedure ends.
/bin/dd if=/dev/mmcblk0p3 of=/home/user/MyDocs/userfs_backup.img
#will create 2GB userfs backup image No progress will be showed. Wait for procedure ends.
#Copy backuped images to PC.

problem is that he has no root access