Backup is the single most important thing a business (or even individuals) must do. The majority of businesses that lose their data fail to survive the year.
It’s boring – but it’s vital!
External Hard Drive
The most common way is a set of external hard drives. Often in pairs, so you can exchange them daily and keep one off site. We recommend drives with some level of toughness, because they should be moved to & from your office on a daily basis. The illustration is our favorite drive, a Freecom “Toughdrive”
Of course, you will need software to actually perform the backup. Windows 7 / 8 & Server 2008/2011 have backup software built in that might be suitable. Otherwise you will need to purchase something that matches your needs.
A “Network Attached Storage” (NAS) unit is a popular for of backup. The most useful ones are RAIDed so that hardware failure is less of an issue. They are fast and effective (once setup). BUT they remain on-site, so unless you have them physically secure & fire/flood proof they don’t fulfill one of the key requirements of a robust backup strategy.
Along these lines, “Windows Home Server” (don’t be put off by the name) is a very useful tool to backup key systems.