If you're searching on how to backup & restore Homebrew, then I assume you're here for the commands.
Brewfiles
Brewfiles are files generated with definitions that Homebrew reads and processes, a generated Brewfile looks similar to the below
tap "heroku/brew"
tap "homebrew/bundle"
tap "homebrew/cask"
tap "homebrew/cask-versions"
tap "homebrew/core"
tap "homebrew/services"
brew "borgmatic"
cask "iterm2-beta"
You can then run the following command to restore all taps, programs and cask-based applications in one go
brew bundle
Backup
Simply run the following command to set up the repository
brew tap Homebrew/bundle
Once complete, you can then perform a single command to backup to your home directory.
brew bundle dump
By default, the Brewfile will be located at ~/Brewfile
Restoring
As mentioned before you can run the brew bundle command to restore from the backup but this will only restore from ~/Brewfile
You can use specific arguments to choose your Brewfile location
brew bundle --help
--file Read the Brewfile from this location. Use
--file=- to pipe to stdin/stdout.
Using --file will allow you to select different Brewfiles. An example of this can be selecting a file from a different snapshot.
brew bundle --file=~/Brewfile-20200531
