Welcome on the ODK forum @tomanix13, don't hesitate to Introduce yourself here! - #1121 by Rico_Kurniawan
You can do that way, you need first to backup and restore your database on the new database server if needed, change the settings in the war file in /WEB-INF/lib/ODKAggregate-settings.jar :
- jdbc properties for database connection the tomcat server in pg_hba.conf
- security.properties (for serve hostname and port)