"Though backup software vendors continue making advancements in technology to speed up the process, the time it takes to backup can still be very time consuming for many IT managers today. A recent survey conducted by Vanson Bourne on 1,000 UK companies suggested businesses are on average backing up to tape once a month, with one rather alarming statistic from the same survey showing 10 percent were only backing up to tape once per year.
This infrequency of backup could realistically be strongly attributable to the time factor involved. Likely, many companies would run their backups on Friday evenings, in the hope for it to be completed by Monday business start. But with such large data pools, these backups might not complete in time, and can therefore often be postponed for larger time frames."