To backup QuickBooks Company file to an external storage device, you must first need to create a backup file. Need Help Backing up Data to USB Drive! Call Number 1.800.579.0391 for Quick Help and Guidance Steps to Transfer QuickBooks Files to a Flash Drive If you are not sure how to backup QuickBooks to flash drive, then follow the instructions mentioned in this article for detailed instructions. Whether you want to transfer your company file to a different computer in the network or you need to take the data to your accountant, thumb drives are the most convenient way to move your data. A flash drive also commonly known as a thumb drive, memory stick, or USB drive is a easy to use, portable, and a fairly inexpensive way to backup QuickBooks data. Backing up data at regular intervals is the key to safeguard your crucial business information stored in the QuickBooks company file.