I use a program called SyncBack that comes from 2brightsparks.com. This program keeps a syncronized backup of the data file and only copies files that have been changed or newly created, i.e., a syncronized backup. There is a free version and a paid version ($30). I used the free version for several years, but finally switched to the mid level paid version called SyncBackSE since it has a few more features and functions that I find very useful. 1. It is easier to configure specific files and folders, 2. It will copy all current security, and 3 It can copy to a named drive which eliminated the sometimes changed drive letters that come when connecting a USB drive. I backup to two different USB hard drives and keep one in my car and one in the house. I try to swap them around every week or two. I started keeping one in my car, which is not garaged, after a friend had his house burn down. RE" named drives I have one USB drive that is red and one that is blue with the really creative names of red drive and blue drive. I could name them both the same and use one backup profile for both drives, but since the backup program keeps logs of each backup including date and time stamps I can see when I last backed by using two profiles with each backing up to a different drive. btw, the paid version never expires and all updates are free. I highly recommend it.
