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Mine is a mostly ketchup/vinegar based concoction and I 'hot pack' in Mason jars. By that I mean the sauce is hot when I put it in hot jars and they seal. Now, I was going to do some commercially a few years back and had to have a food lab test the product. I submitted 3 jars to them. One freshly made, one 6 months old and one a year old just for grins. Lo & behold, the one packed for a year was fine. Now, I don't use any fresh ingredients such as onions or peppers that might be a problem. But with the vinegar and vinegar based ketchup in mine it lasted months with no problem. You should be fine with it holding a few months if you make a huge batch but be on the safe side depending on what you put in it.
Thanks. Yes one is Jeff's and the other is the one I been making. If it is good for a few weeks that fine. Freezing is a good thought. When I make my Pesto Sauce I freeze some in small containers, I think I will do the same with the B-B-Q Sauce.