Is there an alternative to Altiris S.V.S. (Altiris Software Virtualization Suite) for OS X? Something that can revert all changes an application has made to the system.
If you just want to know what files changed and lose their original values is to look at the fsevenets that are generated during the update. Apple programming doc
You can see them using tools such as fseventer
The easiest way to do this requires planning before install.
Take a time machine backup just before and just after the install. The later backup will just o[y over the changes.
If on Leopard there is a tool that will show the changes