Home Assistant Backup to B2

• Home Assistant creates a backup every night, which is stored in the docker volume

• A systemd timer creates a daily backup of the that file

• An S3 bucket at B2 is set up to keep the backup files. It is set without versioning, so that we keep only the last generation for a day of the week or week of the year. Yearly backups will be kept "forever".

• There are seven daily backup files uploaed to an S3 bucket:

  • home-assistant-backup.Monday.tar.gz
  • home-assistant-backup.Tuesday.tar.gz
  • ...
  • home-assistant-backup.Sunday.tar.gz

• Likewise, there is a backup file for each week of the year, copied on Sunday:

  • home-assistant-backup.week-01.tar.gz
  • ...
  • home-assistant-backup.week-53.tar.gz

  Same for each year; the file of Dec 31st of each year is kept as:

  • home-assistant-backup.2022.tar.gz
  • home-assistant-backup.2023.tar.gz
  • ...

Restore

As per doc, unarchiving the tarball and placing it in /config/backup should be enough for the UI to find it. When I tried this, the UI did not offer any means to restore. Instead, I

• unpacked the contained homeassistant.tar.gz and
• moved the contents of the data directory to where /config/backup is mounted.

This worked flawlessly.