Heroku automatic db backup via cron job

Is it possible to backup Heroku database 开发者_开发知识库using cron jobs?

I tried putting the following line into cron.rake:

heroku pgbackups:capture --expire

However it didn't work. The line works when I run it from Terminal.

Can you help?

Check out the heroku_s3_backup gem, which packages up the code necessary to do this in a neat way.

The gem heroku_backup_task integrates directly with the free PG Backups add-on for Heroku.