-If you know you don't want to keep a recording pass, use Ctrl-space to stop recording. This keeps it from ever writing the unneeded file.
-Create a takes toolbar with buttons for 'Delete active take' and 'Crop to active take' to clean out bad takes easily.
-After mixing is done,
1) use 'Save project as' with 'new folder' and 'copy audio files' ticked, and save to your backup drive (which backs up only the stuff you want to keep). Then (2) delete project folder on the work drive.
Then (3) 'Save project as' with 'new folder' and 'copy audio files' ticked, and save back to your working drive.
Voila, all unneeded files are gone, and your project is backed up as well.
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