A question about migration

Hi everyone,
Sorry about posting this here, but since the Weblog is one of the scripts I use, it does belong here, and there is no kind of "General Topics" forum, so...

My question is:
I am about to change hosting providers,and now I wonder what to do about my Maian scripts.
I have backups of my MySQL databases, but what to do with the other script data?

Do I just, like I do with my website data, copy them over from the old to the new hosting or do I re-install them altogether?
Also, I have a license for some of them, what do I do to keep those after the migration, do I need to do anything special?

Thanks in advance for any help.