How long do we want CEDARS to hold onto CET output files?

Question for the data reporting PCG:

The CET module was added to CEDARS in 2018 and to date more than 120K CET runs have been done in production. We currently keep CET input/output files from runs indefinitely. It would help us plan for future disk size updates to know if we want to continue to keep all files and make them available to the person who uploaded them indefinitely, or if we want to set a window where files uploaded more than X years ago are deleted.