Some years ago, I was taking over the IT work at a small business. Back ups were being done on a regular basis and from all appearances disaster would be averted if a server or client computer crashed.
Enter an Outlook client that was hosted on a local machine. Nearly all of the small business's marketing correspondence, contact list, and other information was sitting on a local machine and the local machine's harddrive was not included in the back up protocol.
Murphy's law happens. The machine's hard drive crashed. And even though the data was eventually retrieved, a busy executive had to do without valuable information for a day or two.
If your small business uses outlook, be sure you're hosting the .pst files on your server for easy back up and data management. You can't live without them.