How can i copy the catalog, modules to new zencart?

[afo]

If there is already information in the database, it will be overwritten.

[level5]

Well i know about back up.. its easy and stuff but one thing is it dont sounds right because if i backup mysql it wont move the images and products, etc to new files or whatever.. so

Also the old zencart's some mysql is not in the shape its messed up a bit.. i have a a theme with full mysql custom. from template monster. if i overwrite the old new zencart then i have to rewrite again for theme skin and things. then i lose all data again its useless i really dont get it..