a. First go To Account setting page by clicking here
b. Now Click on Download a copy of your Facebook data
c. Now a new page will open with Download your information.
d. Click on Start My Archive Button at bottom
e. New Page will open with following message " It may take a little while for us to gather your photos, wall posts, messages, and other information. We will then ask you to verify your identity in order to help protect the security of your account. "
f. Soon you will get a link from Facebook to your email to download Zip file.
g. Now download your copy to your computer or laptop