UID-ZPS is a backup copy file created with Zoner Photo Studio software tool. UID-ZPS files store image backups for images edited using Zoner Photo Studio. Image backups allow users to access original, unedited images.

UID-ZPS files are saved in the base image folder. Each modification added to an image results in creation of associated backup image which is added to the folder. To save folder space, the function for generating backup images can be disabled in the program.