Keeping numbers confidential for clients or for yourself is important. That is why using a USB flash drive allows you to have easy access but can keep it away from being stacked onto the kitchen counter for the public to see. You can keep track of all of your previous financials on records as well as any new financial numbers that are added on. Accountants would also benefit from using USB flash drives because it keeps everything organized into files which makes it easier for clients that come in to understand where all their documents are located.