After upgrading from Symantec Endpoint Protection Manager (SEPM) 14.3 MP1 or below, with an embedded database, to 14.3 RU1 or newer, the SEPM disk usage is higher by more than 50%.
Legacy Sybase database files failed to purge after successful upgrade.
If the SEPM has successfully upgraded and is functioning with the new SQL Express database then prior Sybase database files may be removed from the legacy location.
If disk space used by the SEPM still appears excessive, please see: Low disk space on a Symantec Endpoint Protection Manager (broadcom.com)