This is all you need to perform and download backup of your profile data.
1) Click Icon
2) Click Settings
3) Click Download a copy
4) Click Start My Archive
5) Enter your password and press Submit
6) Click Start My Archive
7) Click Okay
8) You will receive an automatic confirmation email from Facebook
9) Click the link to download your data
* You will this email within some minutes depends on your data size.
10) Click Download Archive
11) Enter your password and press Submit
* You will be asked to save file on your computer.
That's it. If you enjoyed these simple guide then share among your friends as this may help them too :)