Writer Parameters
Overwrite Existing Geodatabase
If this option is checked, the existing database is deleted.
Template File Geodatabase
If a template File Geodatabase is specified, the writer will make a copy of the template into the location specified in the Dataset parameter. All operations will be performed on the copy while the original template File Geodatabase remains unchanged.
The parameter is available only when Overwrite Existing Database is enabled.
Note: Since it is doing a complete copy, any data present in the template will also be copied to the destination. To remove unwanted data from tables or feature classes, set Truncate Table to Yes on each feature type. Alternatively, to copy only schema and not data, use ArcGIS to export the schema to an XML Workspace Document, then set the writer to import the resultant schema with the Import XML Workspace Document (Schema Only) parameter (below).