Creating DMG from installed applications??

[jimedit1]

Is there a way to create a back up install disc from software that has already been installed, but the original discs lost?

 

[Makosuke]

If it's a "simple" install--that is, the kind where you just drag the application to the Applications folder and you're done--then just save a copy of the Application itself.

If it needs an installer--something like Photoshop--then you're probably out of luck, although you may still be able to just grab the application and use that (depends on whether its a "necessary" installer, or it's just putting the application where it belongs).