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Automatic backup failed after installing 2026.4.0 and history gone #167441

Description

@brietman

The problem

Automatic backup failed after installing 2026.4.0 and history seems to be gone.

Update went great. But when the Home Assistant should auto backup around 5:00. The backup failed and my history is gone. The failed backup itself is around 500mb smaller. Everything else, besides the history data, in the backup it is just fine. Triggering a automatic backup manually, does not cause a issue. I presume because some integration / automation is running at that time, causing a failed backup.

Happened two times. First I thought, no issues. Because the update went well. And maybe I enabled Purpose-specific triggers and conditions. But no. It seems it's the update.

What version of Home Assistant Core has the issue?

2026.4.0 and 2026.4.1

What was the last working version of Home Assistant Core?

2026.3

What type of installation are you running?

Home Assistant OS

Integration causing the issue

Backup

Link to integration documentation on our website

https://www.home-assistant.io/integrations/backup/

Diagnostics information

No response

Example YAML snippet

Anything in the logs that might be useful for us?

Additional information

I forget to backup the log, before restoring a previous backup. Sorry.

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