I had a situation where I had to quit Photoshop immediately, but it wouldn’t let me because a background save was in progress. I don’t like killing a program with the Task Manager during a write operation,
but that’s what I had to do.
If there’s a way to cancel a lengthy background save or to view its progress, I haven’t found it yet. There needs to be a way to do this.
Yes, if you want you can disable the Background save and change the Auto Save Recovery option as well.
For that you need to Go To Edit -> Preferences -> File Handling -> Uncheck the "Save in Background" checkbox and/or Uncheck the "Auto Save Recovery"
Yes, look at the bottom of the image window where you see the progress of the save, there is a little "x" click that and the save is aborted.
Hope this helps, and hopefully it is a gracefeul cancel