As we know iPhone backups includes useful information, personal data, account login details so it is necessary to encrypt the iPhone backups so that no one can access these backups. If you don’t know how to encrypt the iPhone backups then simply follow the step by step instructions posted below using which you can easily encrypt and password protect your iPhone backups.
STEP 1. First you have to launch iTunes after connecting your iPhone to the computer.
STEP 2. Now in the iTunes sidebar you have to select iPhone and then scroll down to ‘Options’ under the “Summary” tab.
STEP 3. Now simply select the checkbox next to “Encrypt iPhone backup”.
STEP 4. Now you will be able to see a screen which will ask you to set an encrypted backup password.
That’s it. You should remember to set an access passcode. From now onwards when you restore your iPhone from the backups you have to enter the password. Also you can activate “self-destruct” feature so that after multiple failed login attempt all your data will be erased automatically. [Via]