python api to backup/restore data

I am working with Postgresql 8.2.4 and Python 2.5.

I would like to know whether an API for accessing Postgresql from
Python exists and whether or not it supports commands for backing up a
database (or schema) and restoring a backup file.

I heard about psycopg and psycopg2 but have no idea of how to use them
for backup/restore operations.

Thank you.