Preferences > File Backup

Configure whether to create backup files.

Autosave

• Auto save enable: enable or disable autosave altogether
  Advance preference: autosave.enabled
  
  
  • Auto save interval: set a custom value for the time interval in seconds (default is 300).
    Advance preference: autosave.interval
    
    
  • Auto save files per layer: set a custom value for the number of backup files per data layer (default is 1).
    Advance preference: autosave.filesPerLayer
    
    If you increase it to 2, JOSM will not only save the last snapshot of your changes, but also the last but one (in case it differs from the last, otherwise an even older snapshot, if available).

Backup

• Keep backup files when saving data layers: enable or disable file backup of data files
  Advance preference: save.keepbackup

If you save a data layer to a local file and the file already exists JOSM writes the data to a temporary file (with a tilde ~ as suffix). It then copies the temporary file to the target file.
Here you can specify whether JOSM should delete the temporary file or whether it should leave it as "backup" in the file system.

Notification

• Notification at each save: choose if you want to see a small notification at each save
  Advance preference: autosave.notification

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