Whenever you try to save a site template greater than 10 mb you might get an error message.
The solution to this issue is that use stsadm and increase the limit of the site template.
STSADM –o setproperty –pn max-template-document-size –pv 524288000
The –pv value is the value, in Bytes, that you wish to set the limit to. The maximum value that can be set is 500 MB or 524288000 Bytes