Never mind all these multiplication exercises. The first question that
should be asked about what can and should be backed up is this: How much
stuff stored on my computer system can I re-download or recover in some
other way? Do I have, say, instrument libraries I can download again? If
so, I don't have to back them up. Do I have programs I can re-install
from the App Store? If so, then I don't have to back them up. Do I have
documents or other data that, if lost, cannot be replaced, or at least,
not replaced easily? Then those absolutely *must* be backed up. By
answering these questions, you can shrink the size of your backup, not
to mention the amount of time it takes to make it. Of course, it will
require some thought and maybe making a list and checking it twice, and
of course customizing your Time Machine backup plan, but it's worth it.
You can get away with smaller backup volumes this way.
It's also a very good plan to have at least one full disk image
backup--something to start with that has nearly everything on it that
you need and/or want in case of a boot-disk failure, otherwise you will
have to start from nothing if you have to replace the boot disk. Copy
Cloner and Super Duper are two applications that can make such backups,
and I think you can boot from those copies to create and set up the
replaced system volume.
If all else fails and your boot drive is toast, there's always the Mac
Recovery system. You can read about it at
https://support.apple.com/en-us/HT201314
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