How to save data every X minutes for trending/analysis offline

[bobbles]

Do a search for 'Watchtower'.
This may do what you want.

[RELEASE] Watchtower long-term metrics app

Watchtower is the all-in-one app for long-term smart home monitoring and data visualization. Staying true to Hubitat's core value, the application works 100% locally, with no reliance on the cloud. Plus, there’s no need for extra hardware like Raspberry Pi or NAS. Check out the Readme link below for implementation details. Important: Use at least version 1.9.2 of Hubitat Package Manager (HPM) to install the app. Older versions sometimes fail to correctly add the app resource files in the File…