Goto C:\users\your name\appdata\roaming\.techniclauncher\tekkit\backups there will be a zip file you can open, it has all your settings and a worlds folder in it.
If you cant find the appdata folder and you have windows 7, open "my computer" on the top left click organize, then click "folder and search options", then click the view tab, then near the bottom it will say "Hidden files and folders" and make sure show hidden files, folders, or drives is selected.