You can host or save it all you want, unless you’re going to go through the hassle of doing that with every release, it’s very possible that what you have saved is outdated and may not work/be compatible/break with future OSes or patches.

Point is you have to depend on software while with a Cold Card you don’t. Something I didn’t mention in my original post is the fact that I don’t want to install unnecessary software on my new computer. No matter how much you trust a company, installing their software opens you up to an additional attack vector.