Updated tools :

Backup

1. Bacula is a set of Open Source, enterprise ready, computer programs that permit you (or the system administrator) to manage backup, recovery, and verification of computer data across a network of computers of different kinds. Bacula is relatively easy to use and efficient, while offering many advanced storage management features that make it easy to find and recover lost or damaged files.
2. rdiff-backup backs up one directory to another, possibly over a network. The target directory ends up a copy of the source directory, but extra reverse diffs are stored in a special subdirectory of that target directory, so you can still recover files lost some time ago. The idea is to combine the best features of a mirror and an incremental backup. rdiff-backup also preserves subdirectories, hard links, dev files, permissions, uid/gid ownership, modification times, extended attributes, acls, and resource forks. Also, rdiff-backup can operate in a bandwidth efficient manner over a pipe, like rsync. Thus you can use rdiff-backup and ssh to securely back a hard drive up to a remote location, and only the differences will be transmitted. Finally, rdiff-backup is easy to use and settings have sensical defaults.
3. rsnapshot and rsnapshot is a filesystem snapshot utility for making backups of local and remote systems.
   Using rsync and hard links, it is possible to keep multiple, full backups instantly available. The disk space required is just a little more than the space of one full backup, plus incrementals.
   Depending on your configuration, it is quite possible to set up in just a few minutes. Files can be restored by the users who own them, without the root user getting involved.
   There are no tapes to change, so once it's set up, your backups can happen automatically untouched by human hands. And because rsnapshot only keeps a fixed (but configurable) number of snapshots, the amount of disk space used will not continuously grow.
   rsnapshot is written entirely in Perl. It should work on any reasonably modern UNIX compatible OS, including: Debian GNU/Linux, Red Hat Linux, Fedora Linux, SuSE Linux, Gentoo Linux, Slackware Linux, FreeBSD, OpenBSD, NetBSD, Solaris, Mac OS X, and even IRIX.
   rsnapshot was originally based on an article called Easy Automated Snapshot-Style Backups with Linux and Rsync.
4. Dirvish is a fast, disk based, rotating network backup system. With dirvish you can maintain a set of complete images of your filesystems with unattended creation and expiration. A dirvish backup vault is like a time machine for your data.
5. Amanda , the Advanced Maryland Automatic Network Disk Archiver, is a backup solution that allows the IT administrator to set up a single master backup server to back up multiple hosts over network to tape drives/changers or disks or optical media. Amanda uses native utilities and formats (e.g. dump and/or GNU tar) and can back up a large number of servers and workstations running multiple versions of Linux or Unix. Amanda uses a native Windows client to back up Microsoft Windows desktops and servers.

Firewalls

1. Gibraltar Gibraltar Security Gateways provide a comprehensive and competitive protection against a multitude of current security risks and threats. They combine several important security applications into one product and provide for secure connections in your network. Gibraltar is either available preinstalled on five different hardware appliances or just as a software release.
2. FIAIF The Goal of FIAIF is to provide a highly customizable script for setting up an iptables based firewall. Unlike many other scripts, FIAIF can be truly customized allowing multiple interfaces (or rather zones). There is no limit on the number of zones. All configuration is done through configuration files. There is no need to understand the script behind it all

Hard Disk Cloning

1. Partimage is opensource disk backup software. It saves partitions having a supported filesystem on a sector basis to an image file. Although it runs under Linux, Windows and most Linux filesystems are supported. The image file can be compressed to save disk space and transfer time and can be split into multiple files to be copied to CDs or DVDs.
2. g4u ("ghosting for unix") is a NetBSD-based bootfloppy/CD-ROM that allows easy cloning of PC harddisks to deploy a common setup on a number of PCs using FTP. The floppy/CD offers two functions. The first is to upload the compressed image of a local harddisk to a FTP server, the other is to restore that image via FTP, uncompress it and write it back to disk. Network configuration is fetched via DHCP. As the harddisk is processed as an image, any filesystem and operating system can be deployed using g4u. Easy cloning of local disks as well as partitions is also supported
3. SystemImager is software which automates Linux installs, software distribution, and production deployment. SystemImager makes it easy to do automated installs (clones), software distribution, content or data distribution, configuration changes, and operating system updates to your network of Linux machines. It can also be used to ensure safe production deployments. By saving your current production image before updating to your new production image, you have a highly reliable contingency mechanism.