.ACD-BAK File Extension
MAGIX ACID Project Backup File
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What is an ACD-BAK file?
Backup file created by MAGIX ACID Pro, Music Studio, or Xpress; stores a backup copy of the currently open .ACD project; saves the real-time copy of the project while editing a music compilation.
ACD-BAK files are created automatically by the software. They are saved to the same directory as the ACD project file. The ACD-BAK file can be used for restoring the most recent edits in the event the program unexpectedly shuts down.
NOTE: ACID was developed by Sony until it was sold to MAGIX in 2016.