zbackup是一个全局去除重复数据备份工具，基于rsync备份理念。这种方式只有新的变化被存储，只要文件不太不同，所需的存储量是非常低的。以前存储的任何备份文件都可以随时读取。与程序格式无关，所以你可以备份任何文件（包括任何类型的文件，专有格式，甚至原始磁盘镜像。
特征：
Parallel LZMA or LZO compression of the stored data
Built-in AES encryption of the stored data
Possibility to delete old backup data
Use of a 64-bit rolling hash, keeping the amount of soft collisions to zero
Repository consists of immutable files. No existing files are ever modified
Written in C++ only with only modest library dependencies
Safe to use in production (see )
Possibility to exchange data between repos without recompression
zbackup 1.5 alpha 更新日志：
Features:
Customizable configuration
Support for OpenBSD, FreeBSD, Cygwin
Possibility to change repository password
Experimental: “cacheless restore”
Experimental: deep GC mode
Zero compression support
Bug fixes:
Memory leakage
File descriptors leakage
Index growing on GC
Maybe some more…
如何在Ubuntu系统中安装数据去重备份工具zbackup 1.5
sudo add-apt-repository ppa:eugenesan/ppa
sudo apt-get update
sudo apt-get install zbackup
