Hi Phil,
Thanks for letting me know you finally found your custom brush category. Hooray!
It's good that you've thought about how to replace the custom brush category in case you need to some time in the future. In addition, it's a good idea to back up all of your custom settings, preferences, and other custom items on the chance you might need to either restore the program to its installed state (by holding down the Shift key while launching Painter), or Uninstall, then reinstall the program.
I find the best way is to back up the whole Workspace folder, and that's easy to do:
1. Launch Painter X..
2. In Window > Workspace > Customize Workspace, make sure the name of the Workspace you want to back up is displayed in the top left area of the dialog box below Workspace:.
3. If the Workspace name is not displayed, click the small arrow on the right side of the rectangle where you see a Workspace name displayed to expand the Workspace list and select the appropriate Workspace.
4. Click the Export Workspace... button at the bottom of the dialog box, navigate to the folder where you want to save it (somewhere outside of the Painter X application/program folder and outside of the Painter X User folder), then click the Save button.
5. If you ever need to restore that Workspace, just open the Customize Workspace dialog box, click the Import Workspace... button, navigate to the folder where you backed it up, highlight the Workspace file and click the Open button.
TIP: When you make any custom changes in Painter X while using your Workspace, you may want to back it up again so it will always contain any custom settings, preferences, and other custom items.
If you have any questions about this procedure, let me know.
Cheers!