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CHAPTER 23 BACKING UP DATA
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Although Simple Backup allows the uninitiated to make quick and regular backups, there are many other ways to package a folder and store it as a single file. Linux users often create archives in the form of .tar files. tar stands for Tape ARchive and refers to backing up data to a magnetic tape backup drive. Originally designed for backing up files with UNIX operating systems, it has also become a standard method of transferring files across the Internet, particularly with regard to source files or other installation programs.
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Note Linux comes with a couple more backup commands, which you might choose to use. They are cpio and pax. Both aim to improve on tar in various ways, but neither is broadly supported at the moment. cpio is installed by default under Ubuntu, and pax can be found via the Ubuntu Software Center. Examine their man pages for more details.
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An archive is a file that can act as a container for other files. The most common type of archive in Linux is the .tar file, but there are many others. Usually you ll use archive files to pack together the contents of a folder, for example, your /home directory. Although you can archive a single file, it s not very useful! Some of the archive types even compress the information so it consumes less space in your disk or is downloaded faster when posted to a web site. To create an archive file, open Nautilus and browse to the parent of the folder you wish to archive. Right-click the folder and select the option Compress The Compress dialog box will open. You can set the name of the destination file and select the type. You have a few options to choose from, each with its specific functionality. Table 23-1 briefly describes each of those options. Some archive types allow you to password-protect its contents so you can add a layer of security to the information. Only users provided with the password will be able to access your files. Additionally, you can select the location in which the new archive file will be created. By default it is in the same path as the folder you are archiving. Table 23-1. Types of Files to Create with the Compress Dialog Box
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.ar .cbz .jar .tar .tar.bz2
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No Yes No No Yes
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PasswordProtected
No Yes No No No
Description
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CHAPTER 23 BACKING UP DATA
File Extension
.tar.gz
Compressed
PasswordProtected
Description
tar archive compressed with gzip, faster operation than bzip2 tar archive compressed with the LZMA algorithm WinZip archive
.tar.lzma .zip
Yes Yes
No Yes
When you create an archive from a folder, the operation is automatically recursive, so it adds all subdirectories to the same archive. Folders and files added to the archive have the initial forward slash removed from their paths. So, rather than store a file in the archive as this: /home/keir/Mail/file1 the file will be stored as follows: home/keir/Mail/file1 The difference between the two forms concerns us when the files are extracted from the archive. If the files had the initial slash, to the particular file would be restored to /home/keir/Mail/file1. If there were already a file of that name in that location, it would be overwritten. With the leading slash removed, a new directory is created wherever you choose to restore the archive. In this example, it creates a new directory called home, and then a directory called keir within that, and so on.
Managing Archive Files
Once you have created an archive file, you can manage its contents just using the File Roller, an archive manager for GNOME that is preinstalled with Ubuntu.
Viewing the Contents of an Archive File
To open an archive with the File Roller, browse to its location in the disk within Nautilus and right-click the archive. Select Open with Archive Manager from the context menu. The File Roller opens, displaying the content of the archive file. You have several options to get more information about the file or change the way its content is displayed, for example as follows: Click File and select Test Integrity to check whether or not the archive is corrupted. Click File and select Properties to view information about the archive, such as location, the date in which it was modified, the size and compression ratio, and so on. Click View and select whether you want to see all files as if they were in the same folder (View All Files, Ctrl+1), or if you want to respect the folder structure in which the files are stored (View as a Folder, Ctrl+2). Click View and select Folders (or press F9) to split the navigation pane and display the folder hierarchy to the left for easier browsing of big and complex archives.
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