

You might also want to keep the license keys for apps handy for reinstallation. Take this time to see which apps you don’t use anymore and make a note so you don’t reinstall it. Make a list of the apps that you use on your Mac.This will be formatted and set up as a bootable installer for macOS Big Sur. You should have a USB drive, at least 16GB in size.

If you have a fast Internet connection, you can move your files to iCloud, Google Drive, OneDrive, Dropbox, or any other storage provider of your choice. It is good to have an external hard drive handy to backup your data.
