2024.12.0: "Preparing backup of Home Assistant Core failed" for scheduled backups

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Describe the issue you are experiencing

Since Supervisor got upgraded from 2024.11.4 to 2024.12.0 on 2024-12-16, my nightly SAMBA backup which fully relies on standard Supervisor snapshot mechanisms, immediately fails. It signals [24-12-18 02:00:42] ERROR: Error occurred! Backup could not be created! Please try again.

Looking in the Supervisor logs, I only get this error line:
2024-12-18 02:00:42.359 ERROR (MainThread) [supervisor.homeassistant.module] Preparing backup of Home Assistant Core failed. Check HA Core logs.

Looking at the HA Core logs, there's nothing special at all at that time, only entries from a custom integration:

2024-12-18 01:59:22.293 WARNING (MainThread) [custom_components.deutschebahn.sensor] Requested 2 connections, but only 1 are available.
2024-12-18 01:59:52.157 WARNING (MainThread) [custom_components.deutschebahn.sensor] Requested 2 connections, but only 1 are available.
2024-12-18 02:00:22.092 WARNING (MainThread) [custom_components.deutschebahn.sensor] Requested 2 connections, but only 1 are available.
2024-12-18 02:00:52.332 WARNING (MainThread) [custom_components.deutschebahn.sensor] Requested 2 connections, but only 1 are available.
2024-12-18 02:01:03.899 WARNING (MainThread) [custom_components.deutschebahn.sensor] Requested 2 connections, but only 1 are available.
2024-12-18 02:01:22.179 WARNING (MainThread) [custom_components.deutschebahn.sensor] Requested 2 connections, but only 1 are available.
2024-12-18 02:01:52.138 WARNING (MainThread) [custom_components.deutschebahn.sensor] Requested 2 connections, but only 1 are available.
2024-12-18 02:02:22.153 WARNING (MainThread) [custom_components.deutschebahn.sensor] Requested 2 connections, but only 1 are available.

Starting the SAMBA backup manually is no issue, the backup is created.

What type of installation are you running?

Home Assistant OS

Which operating system are you running on?

Home Assistant Operating System

Steps to reproduce the issue

1. Upgrade Supervisor to 2024.12.0
2. Schedule a backup containing HA Core with SAMBA backup

Anything in the Supervisor logs that might be useful for us?

Automated (at 2 a.m. in the night):

...
2024-12-18 01:59:29.640 INFO (MainThread) [supervisor.auth] Successful login for 'xxx'
2024-12-18 02:00:12.028 INFO (MainThread) [supervisor.api.middleware.security] /core/info access from 15d21743_samba_backup
2024-12-18 02:00:12.121 INFO (MainThread) [supervisor.api.middleware.security] /addons access from 15d21743_samba_backup
2024-12-18 02:00:12.318 INFO (MainThread) [supervisor.api.middleware.security] /backups/new/partial access from 15d21743_samba_backup
2024-12-18 02:00:12.321 INFO (MainThread) [supervisor.backups.manager] Backup 8eef5384 starting stage addon_repositories
2024-12-18 02:00:12.322 INFO (MainThread) [supervisor.backups.manager] Backup 8eef5384 starting stage docker_config
2024-12-18 02:00:12.322 INFO (MainThread) [supervisor.backups.manager] Creating new partial backup with slug 8eef5384
2024-12-18 02:00:12.327 INFO (MainThread) [supervisor.backups.manager] Backup 8eef5384 starting stage home_assistant
2024-12-18 02:00:42.359 ERROR (MainThread) [supervisor.homeassistant.module] Preparing backup of Home Assistant Core failed. Check HA Core logs.
2024-12-18 02:00:42.642 INFO (MainThread) [supervisor.api.middleware.security] /backups access from 15d21743_samba_backup
2024-12-18 02:04:08.253 INFO (MainThread) [supervisor.homeassistant.api] Updated Home Assistant API token
...

Manually:

...
2024-12-18 17:14:29.795 INFO (MainThread) [supervisor.api.middleware.security] /core/info access from 15d21743_samba_backup
2024-12-18 17:14:29.916 INFO (MainThread) [supervisor.api.middleware.security] /addons access from 15d21743_samba_backup
2024-12-18 17:14:30.060 INFO (MainThread) [supervisor.api.middleware.security] /backups/new/partial access from 15d21743_samba_backup
2024-12-18 17:14:30.077 INFO (MainThread) [supervisor.backups.manager] Backup cb40ec5b starting stage addon_repositories
2024-12-18 17:14:30.078 INFO (MainThread) [supervisor.backups.manager] Backup cb40ec5b starting stage docker_config
2024-12-18 17:14:30.078 INFO (MainThread) [supervisor.backups.manager] Creating new partial backup with slug cb40ec5b
2024-12-18 17:14:30.085 INFO (MainThread) [supervisor.backups.manager] Backup cb40ec5b starting stage home_assistant
2024-12-18 17:14:30.983 INFO (MainThread) [supervisor.homeassistant.module] Backing up Home Assistant Core config folder
2024-12-18 17:19:12.444 WARNING (MainThread) [supervisor.addons.addon] Watchdog found addon Whisper is unhealthy, restarting...
2024-12-18 17:19:31.902 INFO (SyncWorker_2) [supervisor.docker.manager] Stopping addon_core_whisper application
2024-12-18 17:20:23.716 INFO (SyncWorker_2) [supervisor.docker.manager] Cleaning addon_core_whisper application
2024-12-18 17:20:26.476 INFO (MainThread) [supervisor.docker.addon] Starting Docker add-on homeassistant/aarch64-addon-whisper with version 2.4.0
2024-12-18 17:30:50.260 INFO (MainThread) [supervisor.homeassistant.module] Backup Home Assistant Core config folder done
2024-12-18 17:30:50.308 INFO (MainThread) [supervisor.backups.manager] Backup cb40ec5b starting stage addons
...

System Health information

System Information

version	core-2024.4.4
installation_type	Home Assistant OS
dev	false
hassio	true
docker	true
user	root
virtualenv	false
python_version	3.12.2
os_name	Linux
os_version	6.6.31-haos-raspi
arch	aarch64
timezone	Europe/Berlin
config_dir	/config

Home Assistant Community Store

GitHub API	ok
GitHub Content	ok
GitHub Web	ok
HACS Data	ok
GitHub API Calls Remaining	5000
Installed Version	2.0.1
Stage	running
Available Repositories	1577
Downloaded Repositories	72

Home Assistant Cloud

logged_in	false
can_reach_cert_server	ok
can_reach_cloud_auth	ok
can_reach_cloud	ok

Home Assistant Supervisor

host_os	Home Assistant OS 13.1
update_channel	stable
supervisor_version	supervisor-2024.12.0
agent_version	1.6.0
docker_version	26.1.4
disk_total	57.8 GB
disk_used	47.0 GB
healthy	true
supported	true
board	rpi4-64
supervisor_api	ok
version_api	ok

Dashboards

dashboards	7
resources	42
views	79
mode	storage

Recorder

oldest_recorder_run	1. Oktober 2024 um 16:46
current_recorder_run	1. Oktober 2024 um 18:46
estimated_db_size	2989.98 MiB
database_engine	sqlite
database_version	3.44.2

Supervisor diagnostics

No response

Additional information

I'm quite confident its related to the 2024.12.0 update. If a Supervisor downgrade is possible, let me know so I can reliably proof that assumption by downgrading to latest working 2024.11.4 again.

[bcutter]

Seems to have magically healed it by itself. No idea why, after the 3rd night it started working again. Still monitoring it for a while. Anyway, interesting to see no response at all after one week... glad it was neither important no urgent in this case.