How restore from backup Menu option gone

Hi,

I am stunned as I can't seem to find the option to restore my phone from a backup anymore. I know it used to be there, but can't seem to find it.

I need to be able to do it, as per my network provider, to get it unlocked as I am past my contract term. Their instructions were: backup your phone, restore from that backup and you are done.

Step 1 - done. Step 2 - Help??

Thanks in advance!

Svetlana