Hello,
Thank you for your KB-post.
By default, historic data (in monitoring database) are kept for 365 days. If you want to keep less monitoring data on the hard disk, you can change the automatic data purging limits: please click on "Setup -> System Administration -> Core & Probes", scroll down to "Historic Data Purging" and under "Historic Sensor Data" you can change for how many days historic data will be kept.
To generally save disk space, enabling the NTFS compression for PRTGs data directory is usually a good option. Because in modern Windows versions, this does not drain performance, but saves a lot of disk space.
Or move the data directory to another larger hard drive: https://kb.paessler.com/en/topic/543-how-can-i-change-the-data-directory-of-my-prtg-installation
Best regards
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