restore postgres system database 8.1.11

Hi All,

On a newly created server I stupidly restored over the top of the
postgres system database using the GUI...(postgresql n00b) and am
wondering a couple of things.

Firstly, if this database is overwritten, is it detrimental to the
running of PostgreSQL?

Secondly is it just a simple matter of restoring it using a backup
from a different PostgreSQL instance installed elsewhere.

Regards,

Patrick

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