Bash script for backing up git repositories

backup.sh

# Before copying, replace GITHUB_USERNAME shown below with your GitHub username
# Copy this into your .bash_profile found in ~/
# When you're inside of a git repo, call "backup" without any arguments to back up the current git repo
# Even when you are outside of a git repo, call "backup REPO_NAME", for example "backup typescript"

function backup() {
	if [ -z "$1" ]
	then
		cloneUrl=$(git config --get remote.origin.url)
	else
		cloneUrl="https://github.com/GITHUB_USERNAME/$1.git"
	fi
	oldDir="$PWD"
	cd ~/Files/Backups
	base=${cloneUrl##*/}
	rm -rf ${base%.*}
	git clone "$cloneUrl"
	cd "$oldDir"
}