I noticed that since configuring the RSS aggregator to automatically import an external feed every hour I noticed that Magnolia started creating backup files every hour as well. It took some code digging to find that this behavior can be controlled by adding a node data called backup and setting it to false (since RSSFeedImportHandler extends ImportHandler and that class creates backups based on a property called backup which can be set via Content2Bean).

It would be helpful if a default node data backup would have been bootstrapped by the RSS aggregator module and if the RSS aggregator module documentation would have mentioned this behavior.