Rekkord

Rekkord is a multi-platform backup tool, with the following features:

Write-only passwords / keys (using asymmetic encryption)
Data deduplication based on content-defined chunking
Data compression with LZ4
Local and remote storage back-ends: local directory, S3 storage, SFTP servers

Rekkord currently is beta quality software, we recommend use for redundant backups.

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License

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

Find more information here: https://www.gnu.org/licenses/#GPL