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# Duplicacy: A new generation cloud backup tool # Duplicacy: A new generation cloud backup tool
This repository contains only binary releases and documentation for Duplicacy. It also serves as an issue tracker for user-developer communication during the beta testing phase. Duplicacy is a new generation cross-platform cloud backup tool based on the idea of [Lock-Free Dedeuplication]([design document](https://github.com/gilbertchen/duplicacy-beta/blob/master/DESIGN.md)). Duplicacy is the only backup tool capable of cross-computer deduplication which allows multiple computers to back up to the same storage simultaneously without using any locks (thus readily amenable to various cloud storage services).
## Overview The repository hosts design documents as well as binary releases of the command line version. There is also a Duplicacy GUI frontend built for Windows and Mac OS X downloadable from https://duplicacy.com. The source code of the command line version is available to the commerical users of the Duplicacy GUI version upon request.
Duplicacy supports major cloud storage providers (Amazon S3, Google Cloud Storage, Microsoft Azure, Dropbox, and Backblaze) and offers all essential features of a modern backup tool: ## Features
Duplicacy currently supports major cloud storage providers (Amazon S3, Google Cloud Storage, Microsoft Azure, Dropbox, and Backblaze) and offers all essential features of a modern backup tool:
* Incremental backup: only back up what has been changed * Incremental backup: only back up what has been changed
* Full snapshot : although each backup is incremental, it must behave like a full snapshot for easy restore and deletion * Full snapshot : although each backup is incremental, it must behave like a full snapshot for easy restore and deletion
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* Concurrent access: multiple clients can back up to the same storage at the same time * Concurrent access: multiple clients can back up to the same storage at the same time
* Snapshot migration: all or selected snapshots can be migrated from one storage to another * Snapshot migration: all or selected snapshots can be migrated from one storage to another
The key idea behind Duplicacy is a concept called **Lock-Free Deduplication**, which can be summarized as follows: The key idea of **Lock-Free Deduplication** can be summarized as follows:
* Use variable-size chunking algorithm to split files into chunks * Use variable-size chunking algorithm to split files into chunks
* Store each chunk in the storage using a file name derived from its hash, and rely on the file system API to manage chunks without using a centralized indexing database * Store each chunk in the storage using a file name derived from its hash, and rely on the file system API to manage chunks without using a centralized indexing database
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| Cloud Support | Extensive | No | No | No | S3 only | **S3, GCS, Azure, Dropbox, Backblaze**| | Cloud Support | Extensive | No | No | No | S3 only | **S3, GCS, Azure, Dropbox, Backblaze**|
| Snapshot Migration | No | No | No | No | No | **Yes** | | Snapshot Migration | No | No | No | No | No | **Yes** |
##License
Duplicacy is free for personal use but any commercial use must be accompanied by a valid [subscription](https://duplicacy.com/buy.html). This rule applis to both the CLI and GUI versions.