Duplicacy

The Docker image azinchen/duplicacy is designed for automated backups by leveraging Duplicacy⁠. As such, it supports:

• A wide range of storage backends (S3, Backblaze B2, Hubic, Dropbox, SFTP, and more)
• Client-side encryption
• Deduplication
• Multi-versioning
• And all the other features available in Duplicacy

This image uses the Duplicacy Command Line version⁠3.2.4.

Supported Architectures

The image is compatible with several architectures including amd64, x86, arm/v6, arm/v7, and arm64.

Running a Duplicacy Container

To start a standalone Duplicacy instance in Docker, you can run:

docker run \
  -v path_to_data:/data \
  -e BACKUP_CRON="0 1 * * *" \
  -e SNAPSHOT_ID="id" \
  -e STORAGE_URL="url" \
  azinchen/duplicacy

Configuring Environment Variables

The container is configured at runtime using environment variables. Below are the available settings:

Backup Settings

• BACKUP_CRON: Specifies the schedule (in crontab format) for running the duplicacy backup command. Without this variable, the backup command will not execute.
• BACKUP_OPTIONS: Defines additional options for the duplicacy backup command. For details, see the duplicacy backup documentation⁠. Defaults are not applied.
• BACKUP_END_CRON: Sets a schedule (in crontab format) for forcefully terminating the duplicacy backup process. If not set, no force kill is performed.

Prune Settings

• PRUNE_CRON: Specifies the schedule (in crontab format) for executing the duplicacy prune command. This command runs only if the variable is set.
• PRUNE_OPTIONS: Provides extra options for the duplicacy prune command. Refer to the duplicacy prune documentation⁠ for more details. Defaults are not applied.
• PRUNE_KEEP_POLICIES: Sets the retention policies for pruning. Multiple policies can be specified by separating them with semicolons. For more details, see duplicacy prune documentation⁠.

General Settings

• GLOBAL_OPTIONS: Specifies global options for any duplicacy command. Check out the global options details⁠ for more information. No defaults are set.
• RUN_JOB_IMMEDIATELY: When set to yes, the container will execute the duplicacy backup and/or duplicacy prune commands immediately upon startup. By default, jobs do not run immediately.
• SNAPSHOT_ID: Provides the snapshot identifier as described in the duplicacy init command documentation here⁠.
• STORAGE_URL: Indicates the storage location URL, as required by the duplicacy init command documentation⁠. Duplicacy supports various storage providers; see the supported storage backends⁠ for details. Login credentials for the storage should be set via environment variables as outlined in the credentials documentation⁠.
• JOB_RANDOM_DELAY: Sets a maximum delay (in seconds) before starting a job. By default, jobs start without delay.
• FILTER_PATTERNS: Defines include/exclude patterns for filtering. Multiple patterns can be separated by semicolons. For more details, refer to the filter documentation⁠.
• DUPLICACY_PASSWORD: When provided, enables encryption for storage by setting the encryption password. See the duplicacy init command details here⁠. Encryption is off by default.

Email Settings

• EMAIL_HOSTNAME_ALIAS: Overrides the container's hostname in email reports.
• EMAIL_FROM: Sets the sender's email address.
• EMAIL_FROM_NAME: Sets the sender's name.
• EMAIL_TO: Specifies the recipient's email address.
• EMAIL_USE_TLS: Enables TLS encryption for the SMTP session.
• EMAIL_SMTP_SERVER: Specifies the SMTP server address.
• EMAIL_SMTP_SERVER_PORT: Defines the port for the SMTP server.
• EMAIL_SMTP_LOGIN: Provides the SMTP server login.
• EMAIL_SMTP_PASSWORD: Provides the SMTP server password.
• EMAIL_LOG_LINES_IN_BODY: Determines the number of lines from the start and end of the log to include in the email report. The default is 10.
• SEND_REPORT_LEVEL: Sets the minimum level of logs to trigger email reports. Options are all or error (default is all).

Time Zone Settings

• TZ: Sets the container's time zone. Acceptable values can be found here⁠. The default is UTC.

Disclaimer

This project utilizes the Duplicacy Command Line version⁠, which is free for personal use. Commercial use requires a license purchase⁠. For complete licensing terms, see here⁠.

Reporting Issues

If you encounter any problems or have questions about this image, please open a GitHub issue⁠ or contact via email⁠.