How can I maintain my Page Setup settings for Photoshop files?

I recently upgraded from O.S. 8.6 to 9.21. Now all of the Page Setup
settings I laboriously set up for my Photoshop files in Photoshop,
Xpress and Pagemaker have been wiped out and replaced with the default settings.

Where are the custom Page Setup settings stored? I'd like to know so I
can back them up periodically.