template0 and template1 databases

I notice that template0 can't be vacuumed; and that
template1 gets vacuumed but has "no relations" per \d.

What do these databases do?

I have a python script that finds all database names
per 'psql -l', vacuums and analyzes them ('vacuumdb -a
-z'), and then pg_dumps them through gzip into
separate files in a defined backup directory.
Currently, the script excludes template0 and template1
from being dumped and gzipped.  Is this correct?  Does
this matter?

I would like to offer up this script and one other for
others to use; but am trying to clean them up first.

Thanks,

Andrew

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