For various reasons, you may want to back up your Usage Meter database. In version 3.1 we switched to vPostgres. The backup procedure we recommend has changed to this:
Log into the command line shell either from the VM’s console, or via ssh.
cd /
sudo -u postgres /opt/vmware/vpostgres/9.2/bin/pg_dump --format=p --file=/tmp/umbackup-plain usage_meter_db
That produces a file, /tmp/umbackup-plain, which contains a backup of the database.