Bash script for backups

Example of bash scripts to automate files and folders backups

Objective : create a script to automate backing up files and folders to a Git account, while securing them with AES encryption.

For anyone who doesn’t trust/want a Cloud to manage their stuff.

Menu

Bash script model: a “menu” script calling dedicated sub-scripts according to user’s choices. Create as many scripts as you’ll have backup scenarii.

#!/bin/bash
cd /home/user/working-directory

# loop menu
while true; do

 # Display options
 echo "BACKUP TOOL"
 echo "................."
 echo "1 Backup 1"
 echo "2 Backup 2"
 echo "3 Backup 3"
 echo "................."

 # Read user input
 read -n 1 -p "Enter your choice (#) or exit (x): " choice
 echo

 # Perform the selected action based on user input
 case "$choice" in
   1)
     echo "Backup 1"
     ./script_1 ;;
   2)
     echo "Backup 2"
     ./script_2 ;;
   3)
     echo "Backup 3"
     ./script_3 ;;
   x)
  exit 0 ;;
   *)
    echo "Invalid choice..." ;;
 esac
done

All sub-scripts must be in the parent working directory.

Sub script model

This script will :

1. copy the file(s) or folder to backup in your Git directory (to be created first of course)
2. encrypt it using GPG AES256 : you’ll be prompted for a passphrase
3. clean the directory
4. push the encrypted file to Git

#!/bin/bash

# WD
cd /home/user/git-directory

# copy file to backup
cp /home/user/other-directory/file.ext ./file.ext

# encrypt file using GPG AES256
gpg -c file.kdbx

# rename with date
now=$(date +%Y%m%d_%H%M)
mv file.kdbx.gpg ./"keep_$now.gpg"

read -p ">> Continue to GIT ? " -n1 -s

# Remove temp files
rm ./file.ext

# GIT operations
git pull
git add *.gpg
git commit -a -m "File backup"
git push

To decrypt your file (you’ll be prompted for the passphrase):

gpg -d --output restored_file.ext ./*gpg

Enjoy!