In this photo galery you can see an overview of the vacuum pump and resin trap setup.
I use two small (but able to achieve a deep vacuum) oil filled rotation pumps, a fast running pump (in a former life used for maintenance purposes for medical MRI equipment) and a slow running (and almost antique) pump (after a long life in a scientific environment this pump is now used for his second multihull building) This one runs continues without any problem (the fast running pump is also able to run for a longer time, but is getting very hot, which I don’t like while unattended) The only worry is to close the vacuum tube to the pump before switching of the power or to totally release the vacuum first. Otherwise the oil will flow in the resin trap, not really a problem, but a pity for the waste of oil. Tightness is crucial. I cannot afford any leakage, because this will ruin the laminate, making an air bubble track from leakage point to venting point. This is the advantage of a small pump. When there is some leakage the pump is not able to achieve a good vacuum. Here is a warning for big pumps justified, where a big pump is able to achieve a good vacuum while you don’t know there is a leakage some where.