Applies to:
QuarkXPress 2016 (12.x)

Quark Backup folder is a new feature which has been added in QuarkXPress 2016, which gets created when the application is launched . A backup copy of a project gets created once it has been saved twice. The backup file is the last saved copy of the project.

Mac: Mac HD\Users\ {Current User } \Documents
Win: C (or Root drive):\Users\ {Current User} \Documents