Idle Curiosity:  Why does TM copy the base OS (Unix, etc.)?

I've been wondering about this for quite a while, and can't think of a reason.
Since TM backups are non-bootable, why take the time, and several gigabytes, to copy stuff that can't be viewed or used in any way? I have no idea how much space Unix takes, but it's got to be a few gigabytes at least, doesn't it?
And it's clear TM really does copy it -- when I first got an external HD, the first thing I did was make a bootable clone via CarbonCopy to a partition. Next I started TM, to a second partition. When TM was done, both partitions were almost exactly the same size.
Any ideas?

I'm not a big fan of SD, but not because it doesn't work. Mainly because I cannot fathom the arcane "scripting" method it uses. My personal preference is Synchronize! Pro X. I like Retrospect but it is not yet universal. It's scripting method is almost as arcane as SD, but at least it has a "learning" scheme that makes scripting it much easier than SD. My other favorites include CCC and Deja Vu, although the latter hasn't been updated in quite some time now.
I do regular scheduled backups to a mirrored RAID and also maintain a separate bootable clone. You can never have too many backups!
I do cloned backups of my laptops to separate external drives. I'm backup up up the gazoo.

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