These things weren't designed for "rescue" but they can certainly be used for such administrative tasks.
An OpenBSD admin I know wanted me to put "everything" on a live DVD, for those just-in-case-I-need-it moments. I think it would have to be on blue-ray, there are 6620 i386 ports, and 6570 amd64 ports. Too big for DVD. But really, that kind of thing is easiest to do on a USB drive, assuming the platforms in question can boot from USB storage. Not all can.
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