ClockworkMod is the most popular recovery for android. It can be used to install new ROMs and perform nandroid backup. The most common and easiest method to install it is through ROM manager.
NOTE:You need to be rooted to install cwm. You can check whether you are rooted by checking for an app called superuser in your app drawer. You must have internet access on your device. If you don’t have internet access, try this method instead.
- Install ROM manager from here.
- Open the app and select ‘flash clockworkmod recovery’.
- Pick your phone.
- Wait till the download is complete.