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    2.0.0 • Public • Published


    Long Term Storage Uploader.

    CLI for uploading very large single files (up to 40 TB) to "cold" long-term cloud storage services for archival/backup purposes.

    Currently supports AWS S3 Glacier and Backblaze B2.

    Demo run of uploading to AWS S3 Glacier using ltsu


    Smart resilience
    Handles service errors gracefully and automatically retries with exponential backoff.
    Efficient transfer
    Uploads in parts simultaneously to balance performance, rate limits, and impact of errors.
    Interruption safe
    Saves progress during upload to support resuming and out-of-order uploading.
    Memory optimised
    Uses file streams and custom hash tree builder for low memory usage, even for large files.


    ltsu is written in TypeScript and requires Node.js version 10 or greater, available on Windows, macOS, and Linux.

    npm is the default package manager that comes with Node.js and is used to install ltsu or run it on demand using npx.


    To install it as a CLI tool:

    npm i -g ltsu

    This creates an executable in the global npm bin folder, so ensure that it's in the PATH environment variable. This folder can be found by running npm bin -g.

    To use it directly without installing:

    npx ltsu --file file --work workdir [...]


    Common arguments

    Name Value Description
    --file Required Path to the file to upload.
    --work Required Path to the directory that is used to hold state, such as information about resuming uploads.
    This folder will be filled with many files, so write permissions are required, existing files might be overwritten, and it may get cluttered.
    It's best to provide an empty directory for the exclusive use of one upload.
    --concurrency Default: 3 How many parts to upload at the same time. A high value might cause rate limiting, increased errors, and degraded performance. A low value might result in very slow total upload times.
    --quiet Optional Hide the progress bar. This option can be used in tandem with verbose.
    --verbose Optional Log whenever a part has been successfully uploaded. This option can be used in tandem with quiet.
    --force Optional Always resume existing session, even if file is not the same or has changed since.
    --service Required, one of: aws, b2 Which cloud service to use.


    To resume an upload, simply run ltsu with the same --file and --work arguments.

    If the file has changed since the last upload session, ltsu will refuse to run. Use --force to override this behaviour.

    AWS S3 Glacier

    Name Description
    --region Region containing vault.
    --access Access key ID.
    --secret Secret access key.
    --vault Vault name.

    The account owning the vault must be the same as the account associated with the credentials. For more information on AWS credentials and S3 Glacier, see here.


    ltsu \
      --file /home/user/Archive.img \
      --work /tmp/archive-backup-2019-03-20 \
      --service aws \
      --region us-east-1 \
      --secret  wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY \
      --vault backups

    Backblaze B2

    An application key is required. Generate one from here. Both master and non-master keys can be used.

    A key has two fields of interest: keyID and applicationKey. These need to be provided to ltsu as arguments.

    Name Description
    --account Key ID.
    --key Application key.
    --bucket Bucket ID (not name).

    Full command format:

    ltsu \
      --file /path/to/file \
      --work /path/to/working/dir \
      --service b2 \
      --account B2_ACCOUNT_ID \
      --key B2_APPLICATION_KEY \
      --bucket B2_BUCKET_ID


    npm i ltsu

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    • wilsonzlin