Assuming you have a repository

Backup a GIT Repository.sh

#!/bin/bash
# (c)2016 KenWare
#
PROJECTS_FILE=$HOME/projects.list
REPO_DIR=/opt/data/git/repositories
BACKUP_LOCATION=/opt/backups/git_backups
CURRENT_DATE=`date +"%Y%m%d%H%M%S"`
for repo in `cat ${PROJECTS_FILE}` ; do
    TARGET_ZIP=${CURRENT_DATE}"_"`echo ${repo}| sed "s/[\/\.]/_/g"`".tar.gz"
    echo "REPOSITORY: "${REPO_DIR}/${repo}
    echo "TARGET....: "${BACKUP_LOCATION}/${TARGET_ZIP}
    tar zcfv ${BACKUP_LOCATION}/${TARGET_ZIP} ${REPO_DIR}/${repo}
    echo "====================================================================="
done
echo "Backing up GIT Home...."
tar zcfv ${BACKUP_LOCATION}/${CURRENT_DATE}"_home_git.tar.gz" /home/git
echo "DONE"