offen/docker-volume-backup
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docker-volume-backup/docs/how-tos/encrypt-backups-using-gpg.md
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Encrypt backups using GPG default How Tos 7

Encrypt backups using GPG

The image supports encrypting backups using GPG out of the box. In case a GPG_PASSPHRASE environment variable is set, the backup archive will be encrypted using the given key and saved as a .gpg file instead.

Assuming you have gpg installed, you can decrypt such a backup using (your OS will prompt for the passphrase before decryption can happen):

gpg -o backup.tar.gz -d backup.tar.gz.gpg