“Since I installed the KNX integration, the hard disk space has been filling up. Without doing much with Home Assistant, I have expanded from 35GB to 90GB in three steps within 4 weeks and now receive the message that only 1% is free. I have a large KNX installation with 7 lines. It seems that HA is saving all telegrams, even though I only use 4 KNX addresses. What can I do to prevent this? Is there a way to identify what is filling up the storage?”
Hi 
!
The KNX integration, by default, stores 1000 telegrams as json. That should be about ~0,4 MB. You can inspect that at config/.storage/knx/.
Hi Matthis,
thx for your help.
The two files in the directory together take up 6MB of storage, so that doesn’t seem to be my problem. I have also checked and deleted backups before. How can I find the cause? The Companion App is also no longer stable. It seems the app is reading some data, as it takes up to 5 minutes before the app becomes usable again!
The largest file in .storage is 2.5MB for the core.entity_registry. However, I found the file home-assistant_v2.db with a size of 74.7GB. I am a beginner and have 2 automations running.
Hartwig
This is not filled by the Knx integration directly, but afaik by HAs state machine, event bus, history etc.
Maybe have a look at Recorder - Home Assistant eg. purge_keep_days.
Or look at the logbook 
or even at the logs 
to see if there are some extensive changes going on.