Ye, of course I can relogin myself and I believe that's the only way then. I have set up 6 email accounts in the mail application (login + settings on each account) for example and that's why I wanted to somehow backup up them and just transfer them to my new computer. I understand I can't do it that way and it's annoying but I guess that's the only way...
Have a good one! Thanks for your help :)