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[SLUG] /proc and /sys

I'm doing a back up exercise, and google is not helping me.

I've done a copy of the entire root drive using <# rsync -a> onto a back up drive (small because all data is on seperate drives).

To what extent are /proc and /sys recreated by the system as required, and to what extent do they need to be backed-up? I hope that question makes sense.