In My srever two Biztalk Backup Jobs are available.

1. Backup BizTalk Server (BizTalkMgmtDb)

Backing up the following databases

BizTalkDTADb , BizTalkMgmtDb , BizTalkMsgBoxDb , SSODB , BizTalkEDIDb & BizTalkRuleEngineDb

2. Backup BizTalk...

This is applicable only when you are upgrading SP3 from SP2.

1. If the installer files are not available in the installer folder, check the installer log file to find out...

I am also facing a similiar problem. I installed SP3 on SQL server 2005 sp2. It appeared to be completed successfully. In log files and all it is showing setup...