Missing data when using Save Site as Template and uploading the template in different site collection.

We are using "save site as template" option of sharepoint 2010 to save the site from one Site Collection and use that template to create a custom site in another site collection.

When the lists data huge , all the rows of the not copied to the new site.
Is there any setting or limitation for this feature?

Also we do not know whether the problem is with "save site as template" or new custom site creation using the saved template.

Thanks
Sarat

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