That’s my idea of ideal food preservation.
For the mechanically inclined, a vacuum pump, vacuum gauge, old freezer, some tubes and a vacuum chamber, one can be made. Youtube has some ideas to copy. A freeze dryer can be made for about a hundred bucks.
Years ago I made my own vacuum pump out of a freezer compressor. If my memory is correct, I think it pulled about 20 in merc vacuum. They are very slow for large chambers, so make a two stage vacuum pump using a common vacuum cleaner as the first stage which evacuates the bulk of the air out in just seconds. The setup requires check valves, gauges and switches, but simple to construct.
Have you run the numbers on which would be cheaper....this or store bought?