Performing a regular backup is always important if you don't want to waste time and loose all the data that you currently have on your Samsung Galaxy S2. When backing up data, your contacts detail, phone settings, wallpaper, music files, photos, caledar schedule are also backup to the Google server.
Here are the steps you can use to activate the auto backup feature.
1. Press the Home key.
2. Choose Settings.
3. Now choose Privacy.
4. On the next screen, select the checkbox back up my data and Automatic restore.
If you prefer to use other third party software to backup your data, then you could try Astro File Manager, Sprite backup and MyBackup.