Q: Is it possible to backup the Runecast database?

A: Yes, using the following linux shell commands.

restore:
sudo systemctl stop rca-app
sudo -u postgres psql -c 'DROP DATABASE rcdb;'
sudo -u postgres psql -c 'CREATE DATABASE rcdb WITH OWNER = rcuser ENCODING = 'UTF8' TABLESPACE = pg_default CONNECTION LIMIT = -1;'
sudo -u postgres pg_restore -F c -v -d rcdb /tmp/rcdb.backup
sudo systemctl start rca-app