pkt is a universal XML packet archiver. It can manipulate files for backing up documents, transferring them across networks, emailing them, and sharing them by other means (p2p etc). It uses plugin filters to do the job and handles virtually any format available if there is a plugin for it. It handles encryption, compression, conversion, parity checking, decryption, decoding, repairing, rebuilding, and other tasks using a universal file format (XML-based). By default, all pkt output is in 7-bit ASCII which is UTF encoded and is compatible with XML parsers. pkt files can be disassembled, reassembled, and repaired by hand if necessary. pkt also supports the use of 8-bit compressed XML packets for its archives using one of several compression algorithms. In general, pkt will try to use the best algorithms available.
FauBackup uses a filesystem on a hard drive for incremental and full backups. All backups can easily be accessed by standard filesystem tools. Later backups to the same filesystem will automatically be incremental, as unchanged files are only hard-linked with the existing version of the file.
DirSync is a directory synchronizer that takes a source and destination directory as arguments and recursively ensures that the two directories are identical. It can be used to create incremental copies of large chunks of data. For example, if your file server's contents are in the directory /data, you can make a copy in a directory called /backup with the command "dirsync /data /backup." The first time you run it, all data will be copied. On subsequent runs, only the changed files are copied.
plbackitup is a simple Perl script for backing up directories/files to a tarball. It uses a flat file database for selecting what to backup, and features logging, excludes, email notification, FTP backup files, scp files, and removing old tarballs in the backup directory. It can be run as a cron job or manually.