I heard the provari boards were good for about 10 years of use or so..
That's what I'm counting on anyway..
I have 6 provari total for my husband and I, a couple regulated mods (going to get another one or two of those) and planning on a couple mechs to last out our lifetimes... but then we have 30 or so years to worry about unless we get hit by lightening or something.. lol..
You should store your spares in a safe deposit box in your bank. /nod. They aren't very expensive for what would effectively be insurance for your vape gear to protect them from theft, fire, and flood. Just don't leave any batteries in the mods or put any batteries in the box.