Dar is a shell command that backs up directory trees and files. It has been tested under Linux, Windows, Solaris, FreeBSD, NetBSD, MacOS X and several other systems. Since version 2.0.0 an Application Interface (API) is available, opening the way for external/independent Graphical User Interfaces like kdar. This API relies on the libdar library, which is the core part of DAR programs.
dar is able to backup from total file system to a single file. Additionally a mechanism of filters permits, based on the filename, to exclude or include some files while backing up or restoring a directory tree. In the other side, a secondary filter mechanism permits to exclude some branches of a directory tree, or to only include some branches.
When making a backup with dar, you have the possibility to make a full backup or a differential backup. A full backup, as expected makes backup of all files as specified on the command line (with or without filters). Instead, a differential backup saves only files that have changed since a given reference backup.
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