That is great you are pressure canning. I want to do that too. I have helped my extended family put away vegetables from the garden before but that isn't really what I want to do. What I want is to be able to quickly can leftovers and to put away things that I have prepared so that I can eat them later.
For example, I want to be able to make a large pot of my favorites like soup and stew in the pressure cooker and then take that large amount of soup and can it into small half pint sized jars so that I can eat them later for individual meals. Most of the store bought soups these days are pretty good tasting in my opinion, chunky brand, all of that, and I am all for just buying them when they are available, but sometimes I just want my own soup because I prefer it, and sometimes I want my own soup because I think you can go places where canned soup won't be available. Also when it is just one person it is harder to make these things because you can't really make a good soup in small quantities.
I've heard of people just leaving leftovers in their pressure cooker and eating them the next day, kind of using the pressure cooker itself as a "can", because it has already killed most of the bacteria, enough to let the food sit at room temperature for a day or more. And I am sure I will do more of that kind of thing myself. But I also want to be able to just toss those leftovers into half pint jars and process them so that I can eat them much later like next week or next month so I don't have to eat the same thing all week just because I was in the mood to cook something.
I love homemade soup and especially thicker stews but I don't make it that often because it's just me eating it. It is easier when there is a freezer around to freeze the leftovers in individual meal sizes, but that's not going to work on a boat. I would really like to be able to reach out and grab a can of my own stew and warm it up and eat it. I make a really good root vegetable stew with chicken in it that I never get tired of.