Modules? osticket doesn't have Modules. So I'm not sure what you mean.
As far as email templates though you should be able to use sql to export the tables, a then import them to the new instance.
ost_email_template
ost_email_template_group
That might cause some issues if you use heavy attachments in your templates some how though.
For everything you can just clone the instance and delete all the tickets.