I vacuum seal jars that I won't open every week or two. I have a few small jars of stuff I harvested a year ago. Very smooth smoke. It has lost a lot of the particular notes (tastes) it had. They're not as pronounced. It's now soft and smooth.
For example, I had some ONA gel near the open tent one plant grew in. It's buds had a "Polar Crystal" taste. Very distinct. It remained since I smoked it last August or so. Tried some a couple days ago and the taste was gone.
You need a Foodsaver vacuum seal attachment for mason jars. That needs an accessory hose for Foodsaver machines. I cut the hose in half and attach it to a hand vacuum pump for bleeding automotive brakes.
You don't want to vacuum seal a jar containing a Boveda pack. There have been reports of them bursting. Boveda has acknowledged that their manufacturing process leaves small air bubbles within the membrane. They expand in vacuum and can rupture the membrane. (It seems superfluous to use vacuum and boveda. Boveda is for holding frequently-accessed buds at a consistent humidity. Vacuum sealing is for buds you don't intend to access for some period of time, no introduction of fresh air to rehumidify.).