In any system where you are relying on the compressor for use daily, it is always recommended to have some form of backup compressor. As compressors are mechanical devices, they will need to be serviced and repaired over time. When installing a new system, look at your air needs and make sure you have a backup that will be able to handle at least 50% of your usage. This will enable you to continue working while the main compressor is being maintained or serviced. If you have any questions on what type of a backup compressor you should have contact CAS or your local CAS distributor.