I had two Facebook accounts and decided to merge them. Since there is no direct way to do so, I have backed up my data of one account and I want to download them into the other. How can I do that?
it's not possible to each and every part of your profiles information,
you can just create albums, and tagyourself in the photos, for restoring tagged photos.
why do you need two accounts btw!
Use SafeSocial. From SafeSocial:
"SocialSafe is an incredibly simple application, built on Adobe’s Air platform, to provide a one touch backup solution that works on PCs and Macs. Once activated it will save all your friends, all your photos, photos friends have tagged you in, and the personal information you’ve added to create your profile. All stored locally, all available to upload to your Facebook account again, when needed."