Since the most recent update to HA (2025.06.1) I’ve been having issues with all my MQTT devices (using Mosquitto) going offline during the scheduled HA backup. This includes anything using MQTT such as Z2M, Solar Assistant, PAI etc. They all come back online again after a minute or so, but this is triggering all my warning and alert automations which tell me if something has gone wrong.
It’s only been happening since Saturday which is when I upgraded to 2025.6.1.
Anyone else have this or similar issue? Pretty weird.
High system load during backup i think
Backups (especially full snapshots) can heavily tax CPU, RAM, and disk I/O.
MQTT broker (e.g., Mosquitto) may become unresponsive or slow, causing devices to disconnect.
What is the setup?
Can you check CPU usage during backup?
I’m running on an Odroid N2+ (HA Blue). The CPU does definitely spike during backups, but this has always been happening. This actually causing device to go offline is new since 2026.6. Never happened before.
They seem to go offline 3 or 4 times for a few seconds during the backup process.
I’ve tried removing Mosquitto from the backup to see if that caused it, but didn’t fix it. Also done a full system reboot in case anything was funky, and I haven’t rebooted since the last OS update, but again no change.
I think I may have found the issue. I have a Linux NAS that I use to store backups as well as local, OneDrive and HA Cloud. I disabled this option and last night the devices did not go offline. Must be an issue there where it causes issues during the backup.