Template
SharePoint Site Template Size
When you turn an existing site into a template and include the content, there is a size limit of 10 Mb by default. If you site content is greater than this, a site template will not be created.
You can change this maximum size using an stsadm command on the SharePoint server.
stsadm -o setproperty -propertyname max-template-document-size -propertyvalue size_in_bytes
Where size can be up to 500Mb (524288000 bytes)