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What is the most critical information to back up?

With a variety of operating systems and network architectures, what is the most critical information that needs to be included in backups?
Depending on what is meant by "critical information," the answer can be as follows: Regardless what type of operating system and network architecture make up an IT environment, the most critical information to be included in backups will always be your business critical application data.

Beyond that, any information (or data) that cannot easily be recreated should be included in the backups. For example, many question the practice of backing up operating system binaries since an OS can be reinstalled just as easily as it can be restored. Besides, you typically need an OS before you can restore anything (including the OS itself). However, any hardware, software or network configuration information should be backed up in some fashion if recreating it requires a lot of time and effort.

Arguably, the order of priority for information backup after business critical data would be: The backup server configuration information (including the media catalog) since this will likely be the first thing you would restore following a disaster. Then comes network configuration, assuming you will be restoring over the network and last, configuration information based on system criticality.

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