Permacomputing

From their intro post:

The fictional situation is the following: there has been some sort of social collapse and the Internet infrastructure is gone: there’s no more Internet for us. Now imagine that in this situation we still find value in our computers; how would we operate them now that we don’t have Internet?

I would like to analyze which Operating Systems would be suitable to for this imaginary scenario. In particular I would like to evaluate the Operating System at the following points:

• Can I store a software repository with the programs that I or someone in my area may need?
• Can I store the source code corresponding to the software repository so that I or someone else can fix potential bugs or extends the programs that we may need to use?
• Can I create new installation images from the OS itself, so that I can install it in other computers?
• Can I store the OS source code so that I or someone else can fix potential bugs or extend the OS funcionality / support and from it build installation images of the OS? And can I achieve all this offline?

There is also a NetBSD version