What is a bup file?

A BUP file is a backup file commonly found in DVD video discs. It is a copy of the corresponding IFO file, which contains information about the video structure and playback settings. BUP files are used as a backup in case the IFO file becomes corrupted or damaged.

BUP files are created automatically when a DVD is burned, and they are typically located in the same directory as the IFO files. BUP files are not meant to be opened or edited directly by users, as they are primarily used by DVD-playing software to ensure proper playback of the video content.

In addition to DVD video discs, BUP files can also be found in other types of data storage devices, such as optical discs and USB drives, where they serve as backup copies of important files or data.