Tools
Image
Document
Object
Miscellaneous

Preferences: Document
Use XML Format: Create normally saves document files in a very readable Property List format. This format doesn't work well with Japanese fonts, so Create provides an option of saving the document in XML. XML files are about twice as large and less readable than property list files.

Save backup file: If checked, whenever you save a file, Create will move your previously saved version to a file named <docfilename>~.cre8. You will always have both the most recently saved version and the previously saved version of your document.

Levels of undo
: Enter the number of changes that you want to be able to undo. The higher the number, the greater your ability to backtrack over your changes, but more memory is required, especially for changes to large images.
Note: To allow unlimited undos, set the number to 0.