Posted 14 November 2007 - 07:56 PM
The best method is to back up to some medium that can be taken with you, off site, in case there is a fire or the server/workstation gets totally fried. An external tape drive or REV drive (like Zip drives) will wind up being the most economical, as you can reuse the media over, unlike CDs. (and don't put important data on Re-Writeable CDs).
If you are concerned of a hard drive crash of your system, the best method for redundancy is a RAID 1 mirror. Some of this can depend on your motherboard and whether it can support RAID 1, as many nowadays can. If it does not support RAID 1 you can purchase a controller card that will come with RAID 1 capabilities. This way, if your system hard drive ever goes south, you have a mirror you can boot into to repair the situation.
If you can't afford that, then creating an image of your system using True Image of Ghost to backup your system monthly and doing weekly backups up to CDs of important data would be the minimum I would suggest.