Open "CWM RECOVERY"(Learn CWM from here) mode on your sgy duos,you will see a window with many options,now go to "Backup and Restore" option;click on it,then you will see a new window with options will arrive,like-
Click "Backup" option,then you will see a booting procedure,with many sentences,like-
Backing up System.....
Backing up Android secure.....
Creating Md5 sums...etc....ete....
This procedure takes some time to compleate.When a back up compleates then you automatically comes back on your recovery windows.The backup saves on your sd card in a folder named "Clockworkmod".
Now Reboot system from CWM with the help of the option "REBOOT SYSTEM" from CWM window.
As like first open "CWM RECOVERY",go to the option "Backup and Restore",click on it,you will see the options like first one,then click on "RESTORE".You will see your backed up rom, then click on it to restore,a boot process with sentences will arrive,like-
Cheking Md5 sums....
Restoring Android secure....
After when restoring compleate,you will turn back on your recovery window automatically.Now Reboot system from CWM with the help of the option "REBOOT SYSTEM" from CWM window.
In CWM you can able to go back on your previous window by touching "back button" of your sgy duos or pressing "++GO BACK++" option on recovery window.
I know all of you are a bit curious like me about to know what is "ADVANCED RESTORE".
It is a restoration type of your rom in parts,not the all rom proggrams.It is restores your rom in parts,like-
1.RESTORE BOOT:By this you can just install your backedup rom's boot part,without reinstalling other parts.
2.RESTORE SYSTEM:By this you can install just system files of backedup rom,without installing other one.
3.RESTORE DATA:This helps to install your data files of your backedup rom.
4.RESTORE CACHE:It installs just the caches of backedup rom.
5.RESTORE SD-EXT:It restores the sd-ext parts of backedup rom.
>HOW TO ADVANCE RESTORE:
Just go to the window of Backup and restore of CWM,then click ln "ADVANCE RESTORE" option;you will see your backed up rom.Click on the rom which you want to restore,then you will see the panel of above mentioned option types,choose the type of restore you want,then it restores just the choosen type.
»Do not rename the backed up rom or the folder which is created by CWM.Otherwise you will loss the backup,it not reinstalls by CWM.
»Do not switch off or remove your battery during this processes.So charge your phone's battery a minimum percentage charge of 80%.
»Do not hide the created folder,otherwise CWM is failed to find it.
**During this process we don't get any risk and responsibility of damaging your devices..please do that at your OWN RISK.....