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# Duplicacy: A lock-free deduplication cloud backup tool
Duplicacy is a new generation cross-platform cloud backup tool based on the idea of [Lock-Free Deduplication](https://github.com/gilbertchen/duplicacy-cli/blob/master/DESIGN.md). It is the only cloud backup tool that allows multiple computers to back up to the same storage simultaneously without using any locks (thus readily amenable to various cloud storage services).
Duplicacy is a new generation cross-platform cloud backup tool based on the idea of [[Lock-Free Deduplication]]. It is the only cloud backup tool that allows multiple computers to back up to the same storage simultaneously without using any locks (thus readily amenable to various cloud storage services).
The repository hosts source code, design documents, and binary releases of the command line version. There is also a Duplicacy GUI frontend built for Windows and Mac OS X available from https://duplicacy.com.
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* 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
The key idea of **Lock-Free Deduplication** 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
* 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
* Apply a *two-step fossil collection* algorithm to remove chunks that become unreferenced after a backup is deleted
The [design document](https://github.com/gilbertchen/duplicacy-cli/blob/master/DESIGN.md) explains lock-free deduplication in detail.
## Getting Started
* [A brief introduction](https://github.com/gilbertchen/duplicacy/wiki/Quick-Start)