What's the best way to backup my access information?

Make a backup of your 24 Recovery Words and Pass Phrase. Do NOT just store them on your computer. Print or write them down on a piece of paper. Store one ore more copies of this paper in one or more secure and private physical locations. A backup is not useful if it is destroyed by a fire or flood along with your laptop. Do not store your recovery words in Dropbox, Google Drive, or other cloud storage. If such account were to be compromised, your funds will be stolen.