How to Backup Your Android's Original ROM

Have you ever lost your Original ROM? If you were me, you've done it. In the past, I tried to install custom rom named Repencis, from Indonesia. But, unfortunately, I red and followed the instructions are true--the rom was installed, but my Stock ROM was lost. I didn't back up my ROM. So, the goal of this article is show you to save your stock ROM. Now check this out!
1. Recovery & pass
2. Download tool for backup ROM
3. Put cwm_recovery.zip into the sd card put it out of the folder(not in the folder)
4. Turn off your phone by  touching power, volume up, and home together (for galaxy y, if your phone isn't galaxy, please open <-this link)
5. select apply from sdcard> CWM_recovery.zip>backup and restore>backup
6. Wait until finish and restart your device
7. Done!

Risk is on yourself