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[Translated] 20141219 Attic--Deduplicating backup program.md
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Translating by GOLinux!
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Attic – Deduplicating backup program
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================================================================================
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Attic is a deduplicating backup program written in Python. The main goal of Attic is to provide an efficient and secure way to backup data. The data deduplication technique used makes Attic suitable for daily backups since only the changes are stored.
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### Attic Features ###
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#### Space efficient storage ####
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Variable block size deduplication is used to reduce the number of bytes stored by detecting redundant data. Each file is split into a number of variable length chunks and only chunks that have never been seen before are compressed and added to the repository.
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#### Optional data encryption ####
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All data can be protected using 256-bit AES encryption and data integrity and authenticity is verified using HMAC-SHA256.
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#### Off-site backups ####
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Attic can store data on any remote host accessible over SSH as long as Attic is installed.
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#### Backups mountable as filesystems ####
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Backup archives are mountable as userspace filesystems for easy backup verification and restores.
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#### Install attic on ubuntu 14.10 ####
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Open the terminal and run the following command
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sudo apt-get install attic
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### Using Attic ###
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#### A step by step example ####
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Before a backup can be made a repository has to be initialized:
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$ attic init /somewhere/my-repository.attic
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Backup the ~/src and ~/Documents directories into an archive called Monday:
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$ attic create /somwhere/my-repository.attic::Monday ~/src ~/Documents
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The next day create a new archive called Tuesday:
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$ attic create --stats /somwhere/my-repository.attic::Tuesday ~/src ~/Documents
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This backup will be a lot quicker and a lot smaller since only new never before seen data is stored. The --stats option causes Attic to output statistics about the newly created archive such as the amount of unique data (not shared with other archives):
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Archive name: Tuesday
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Archive fingerprint: 387a5e3f9b0e792e91ce87134b0f4bfe17677d9248cb5337f3fbf3a8e157942a
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Start time: Tue Mar 25 12:00:10 2014
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End time: Tue Mar 25 12:00:10 2014
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Duration: 0.08 seconds
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Number of files: 358
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Original size Compressed size Deduplicated size
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This archive: 57.16 MB 46.78 MB 151.67 kB
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All archives: 114.02 MB 93.46 MB 44.81 MB
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List all archives in the repository:
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$ attic list /somewhere/my-repository.attic
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Monday Mon Mar 24 11:59:35 2014
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Tuesday Tue Mar 25 12:00:10 2014
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List the contents of the Monday archive:
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$ attic list /somewhere/my-repository.attic::Monday
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drwxr-xr-x user group 0 Jan 06 15:22 home/user/Documents
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-rw-r--r-- user group 7961 Nov 17 2012 home/user/Documents/Important.doc
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Restore the Monday archive:
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$ attic extract /somwhere/my-repository.attic::Monday
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Recover disk space by manually deleting the Monday archive:
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$ attic delete /somwhere/my-backup.attic::Monday
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Check the [Attic Documentation][1] for more details
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--------------------------------------------------------------------------------
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via: http://www.ubuntugeek.com/attic-deduplicating-backup-program.html
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作者：[ruchi][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
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[a]:http://www.ubuntugeek.com/author/ubuntufix
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[1]:https://attic-backup.org/index.html
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Attic——重复数据删除备份程序
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================================================================================
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Attic是一个Python写的重复数据删除备份程序，其主要目标是提供一种高效安全的数据备份方式。重复数据消除技术的使用使得Attic适用于日常备份，因为它可以只存储那些修改过的数据。
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### Attic特性 ###
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#### 空间高效存储 ####
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可变块大小重复数据消除技术用于减少检测到的冗余数据存储字节数量。每个文件被分割成若干可变长度组块，只有那些从没见过的组块会被压缩并添加到仓库中。
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#### 可选数据加密 ####
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所有数据可以使用256位AES加密进行保护，并使用HMAC-SHA256验证数据完整性和真实性。
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#### 离场备份 ####
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Attic可以通过SSH将数据存储到安装有Attic的远程主机上。
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#### 备份可作为文件系统挂载 ####
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备份归档可作为用户空间文件系统挂载，用于便捷地验证和恢复备份。
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#### 安装attic到ubuntu 14.10 ####
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打开终端并运行以下命令
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sudo apt-get install attic
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### 使用Attic ###
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#### 手把手实例教学 ####
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在进行备份之前，首先要对仓库进行初始化：
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$ attic init /somewhere/my-repository.attic
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将~/src和~/Documents目录备份到名为Monday的归档：
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$ attic create /somwhere/my-repository.attic::Monday ~/src ~/Documents
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第二天创建一个新的名为Tuesday的归档：
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$ attic create --stats /somwhere/my-repository.attic::Tuesday ~/src ~/Documents
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该备份将更快些，也更小些，因为只有之前从没见过的新数据会被存储。--stats选项会让Attic输出关于新创建的归档的统计数据，比如唯一数据（不和其它归档共享）的数量：
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归档名：Tuesday
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归档指纹：387a5e3f9b0e792e91ce87134b0f4bfe17677d9248cb5337f3fbf3a8e157942a
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开始时间： Tue Mar 25 12:00:10 2014
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结束时间： Tue Mar 25 12:00:10 2014
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持续时间： 0.08 seconds
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文件数量： 358
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最初大小 压缩后大小 重复数据删除后大小
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本归档： 57.16 MB 46.78 MB 151.67 kB
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所有归档：114.02 MB 93.46 MB 44.81 MB
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列出仓库中所有归档：
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$ attic list /somewhere/my-repository.attic
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Monday Mon Mar 24 11:59:35 2014
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Tuesday Tue Mar 25 12:00:10 2014
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列出Monday归档的内容：
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$ attic list /somewhere/my-repository.attic::Monday
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drwxr-xr-x user group 0 Jan 06 15:22 home/user/Documents
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-rw-r--r-- user group 7961 Nov 17 2012 home/user/Documents/Important.doc
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恢复Monday归档：
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$ attic extract /somwhere/my-repository.attic::Monday
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通过手动删除Monday归档恢复磁盘空间：
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$ attic delete /somwhere/my-backup.attic::Monday
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详情请查阅[Attic文档][1]
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--------------------------------------------------------------------------------
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via: http://www.ubuntugeek.com/attic-deduplicating-backup-program.html
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作者：[ruchi][a]
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译者：[GOLinux](https://github.com/GOLinux)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
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[a]:http://www.ubuntugeek.com/author/ubuntufix
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[1]:https://attic-backup.org/index.html
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