I personally wouldn’t use only glass jars for long term storage. They do slowly but surely dry out. I remember the last time I moved, I had forgotten I’d hidden a QP in 2 mason jars and put them in a zip compartment under some chair I had. Anyways when the time came to actually move the chair, when I tried to pick it up I heard clanking of glass so I open it up and find a bunch of weed from months ago. I know it was sticky and dank when I put it in, it was now super dry and dusty, smoke was nowhere near as good as it was just a few months before. Maybe get a cheap hygrometer that fits in whatever storage container to make sure. There is a possibility that my lids could have been old or damaged.
I have heard of people vac sealing weed in jars for long term and when they open it every strain had the same weird smell which I could only attribute to something like anaerobic bacteria. I doubt this would happen every time but just the possibility would make me want to go another route. I couldn’t imagine saving something for so long only to open it and not want it.
The longest I’ve successfully stored bud is around 6 months in a c vault with Boveda 62 packs. the bud was still moist and sticky but it had started to oxidize. I’m thinking about trying to put in a few desiccant packs to see if that would stop or reduce the aging process. I also heard that relative humidity below that level (too dry) halts the curing process so I’d try to keep it in the range of 60-64%.
You could probably get away with using a combination of jars and a 62% pack. I’d imagine one or a few would counteract the possible slow moisture loss though the lid. Id put those jars maybe in a thick black plastic bag for the light and store somewhere cool.
I personally haven’t tried vac sealing in a bag and freezing it but I’d be interested to know if it works. Maybe it’s time for an experiment. I’d be worried about freezer burn though for long term.