Overwrite previous backup after manually copying files

I searched for an answer but didnt find one. XP machine backed up to My Book with Smartware. On new win 7 machine, dragged n dropped files from the My Book to the new machine. Smartware is installed on new machine. Will the first backup on new machine be a full backup and overwrite all the same files or just a differential backup of any changed files?

Can I just hit ‘backup’ and walk away?

Thank you

Did it. Just a differential. Thanks a bunch