I’ve had HA successfully backing up the daily automatic backup to my TrueNAS for weeks. After upgrading to 2025.12.1 things continued to work but about the time I when to 2025.12.2 (Core) - 2025.12.3 (Supervisor) things broke.
Diving into the logs I find the usual WARNING about HACS (twice in one boot seems overkill) and then what I’d assume is my issue:
2025-12-11 22:58:26.708 ERROR (MainThread) [homeassistant.components.backup] Unexpected error for hassio.HA_backups: Could delete backup at /data/mounts/HA_backups/Automatic_backup_2025.12.1_2025-12-07_05.26_06004440.tar: [Errno 13] Permission denied: ‘/data/mounts/HA_backups/Automatic_backup_2025.12.1_2025-12-07_05.26_06004440.tar’
What kind of an error is “Could delete backup at”? Would seem to make more sense to say “Could not delete backup at” but I’m guessing this is just translation problem of the error message text due to localization (English).
Was there a change to the authentication of off-HA file locations?
I have created an habackup user in TrueNAS that matches the one specified in the Update network storage dialogue of HA for the target directory. Oddly when I go back to double check, the Username and Password in HA appear blank, suggesting they were never saved initially. When I reenter them and click Update, they are again gone the next time I look.
As an aside - is there any way to correlate the list of backups shown at Settings->System->Backups listed as 'My backups" with the actual file name and time stamps as viewed in the TrueNAS file listing. HA seems to only label things as “Automatic backup 2025.12.[12]” not any more specific. The file names on the TrueNAS contain are a concatenation of the backup type, HA version, date, and time (relative to GMT, not localized).