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Once you’ve made a backup of your current ROM, you will also want to learn how to backup and restore with Titanium Backup app as this method will allow you to quickly restore your apps when you install a new ROM on your Galaxy S2. (The ClockworkMod method backups up your WHOLE system including the ROM itself so you need another method to restore your apps such as this Titanium Backup app when installing new ROMs.)
First, you will need a rooted Galaxy S2 of course. Next, go ahead and download the free version of Titanium Backup app from Market.
Second, hit “RUN” next to “Backup all new apps & new verison”, this will backup all of your non-system apps such as ones you’ve installed off the Market.
Once that’s done, you can go hit the “Backup/Restore” tab, which will show you all the apps that’s backed up. If there’s an app you want backed up but didn’t backup, you can manually back it up here. I did that with the Memo app, which contains some important memos that my friend wanted to keep on his Galaxy S2 after moving to a new ROM.
After you install a new ROM, simply install Titanium Backup app again from the market, hit Menu->Batch then “Restore all apps with data” to restore all of your apps.