Backup and Restore a Subversion Repository

First, here's how back up the repository to a compressed file:

$ svnadmin dump /path/to/repo | gzip > backup.gz

And how to restore it:

$ gunzip -c backup.gz | svnadmin load /path/to/repo

Those commands are meant for UNIX or Linux so you will have to adapt 
them if you are running Windows. It shouldn't be too difficult to do so,
 especially if you are using Cygwin.

What is the difference between Hard Link and Soft Link in Linux

Hard link: Hard link refers to "The specific location of physical data".

• Hard Link is a mirror copy of the original file.
• Hard links share the same inode.
• Any changes made to the original or Hard linked file will reflect the other.
• Even if you delete any one of the files, nothing will happen to the other hard links.
• But soft link which points to deleted hard link become a dangling soft link.
• You can't link a directory even within the same file system.
• Hard links can't cross file systems.

Soft link( also called symbolic link): Soft link refers to "A symbolic path indicating the abstract location of another file".

• Soft Link is a symbolic link to the original file.(more like windows shortcuts)
• Soft Links will have a different Inode value.
• Any changes made to the soft link will reflect the original file and its hard links.
• A soft link points to the original file. If you delete the original file, the soft link fails. It would become dangling symbolic link.
• If you delete the soft link, nothing will happen.
• You can link a directory using soft link on same file system and also on other file system.
• Soft links can cross file systems

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Bare Metal Recovery Solution Mondo Backup

Here's an interesting alternative to using CloneZilla and the likes for Bare Metal Recovery:

Mondo Rescue is a free (GPL) powerful disaster recovery suite for Linux (i386, x86_64, ia64) and FreeBSD (i386). It's packaged for multiple distributions (RedHat, RHEL, SuSE, SLES, Mandriva, Debian, Gentoo). It's basically the Linux equivalent of the powerful AIX mkcd / mkdvd.

It supports backups to tapes, disks, network and CD/DVD. It also supports multiple filesystems (ext2, ext3, JFS, XFS, ResierFS, VFAT and even NTFS), LVM, software and hardware Raid.

Example of using Mondo Rescue:

Generate a bootable DVD that also backs up /etc and can recover files running mondorestore:

# mondoarchive -OVr -d /dev/dvd -9 -I /etc -gF

Another interesting tool worth checking out is System Imager (automates Linux installs).