How to backup and restore with tar in ext4

# Precautions
# --------------------------------------------------
#
# - only tesed with FuguMod >= 2.0 and SpeedMod >= K13D
# - you do all those commands while booted into Recovery Mode
# - be sure to have enough space free on internal SD
# - It restores to ext4-all

# Fast one-liners for copy & paste
# --------------------------------------------------
# *** BACKUP ***
mount /dev/block/mmcblk0p1 /mnt/sdcard; mount /dev/block/mmcblk0p2 /data; mount /dev/block/stl10 /dbdata; rm /mnt/sdcard/system.tar /mnt/sdcard/data.tar /mnt/sdcard/dbdata.tar && cd / && tar cvf /mnt/sdcard/system.tar /system && tar cvf /mnt/sdcard/data.tar /data && tar cvf /mnt/sdcard/dbdata.tar /dbdata

# *** RESTORE ***
umount /system; umount /data; umount /mnt/sdcard; umount /dbdata; umount /cache; /sbin/mke2fs -J size=4 -T ext4 -b 4096 -O ^resize_inode,^ext_attr,^huge_file /dev/block/stl9 && /sbin/mke2fs -J size=4 -T ext4 -b 4096 -O ^resize_inode,^ext_attr,^huge_file /dev/block/mmcblk0p2 && /sbin/mke2fs -J size=4 -T ext4 -b 4096 -O ^resize_inode,^ext_attr,^huge_file /dev/block/stl10 && /sbin/mke2fs -J size=4 -T ext4 -b 4096 -O ^resize_inode,^ext_attr,^huge_file /dev/block/stl11 && mount /dev/block/mmcblk0p1 /mnt/sdcard; mount /dev/block/mmcblk0p2 /data; mount /dev/block/stl9 /system; mount /dev/block/stl10 /dbdata; mount /dev/block/stl11 /cache; cd / && tar xvf /mnt/sdcard/system.tar && tar xvf /mnt/sdcard/data.tar && tar xvf /mnt/sdcard/dbdata.tar

# backup - in adb shell (as root) do:
# --------------------------------------------------
# mount all filesystems
mount /dev/block/mmcblk0p1 /mnt/sdcard
mount /dev/block/mmcblk0p2 /data
mount /dev/block/stl9 /system
mount /dev/block/stl10 /dbdata
# remove older backups
rm /mnt/sdcard/data.tar /mnt/sdcard/system.tar /mnt/sdcard/dbdata.tar
# backup them all to the root of the internal sdcard (make sure enough space is free)
cd /
tar cvf /mnt/sdcard/system.tar /system
tar cvf /mnt/sdcard/data.tar /data
tar cvf /mnt/sdcard/dbdata.tar /dbdata
# restore - process
# --------------------------------------------------
# flash stock ROM with Odin/heimdall
# flash fugumod with Odin/heimdall
# reboot recovery - claim root and open a shell
adb root
adb shell
# unmount all filesystems
umount /system
umount /data
umount /mnt/sdcard
umount /dbdata
umount /cache
umount -f /cache
# recreate filesystems (jfs)
/sbin/mke2fs -J size=4 -T ext4 -b 4096 -O ^resize_inode,^ext_attr,^huge_file /dev/block/stl9
/sbin/mke2fs -J size=4 -T ext4 -b 4096 -O ^resize_inode,^ext_attr,^huge_file /dev/block/mmcblk0p2
/sbin/mke2fs -J size=4 -T ext4 -b 4096 -O ^resize_inode,^ext_attr,^huge_file /dev/block/stl10
/sbin/mke2fs -J size=4 -T ext4 -b 4096 -O ^resize_inode,^ext_attr,^huge_file /dev/block/stl11
# mount all filesystems and internal sdcard
mount /dev/block/mmcblk0p1 /mnt/sdcard
mount /dev/block/mmcblk0p2 /data
mount /dev/block/stl9 /system
mount /dev/block/stl10 /dbdata
mount /dev/block/stl11 /cache
# restore the tar
cd /
tar xvf /mnt/sdcard/system.tar
tar xvf /mnt/sdcard/data.tar
tar xvf /mnt/sdcard/dbdata.tar
# reboot
reboot bootloader