Simple linux server backup script automating use of rsync and 7zip to create a rotated N backup archives.

server-backup.sh

#!/bin/bash

#
# Simple utility to perform rotated compressed backups.
# Works best when added to crontab:
#       0 21 * * 1 /root/server-backup.sh
#
# Requirements:
#   $ sudo apt-get install p7zip-full rsync
#

# =============================
# CONFIGURATION

# Number of backups to take/rotate
BACKUPS=5

# User to authenticate into server
USER=john.doe

# Server's address/hostname
SERVER=example.com

# Destination path where to backup specified server.
DEST_PATH=<dest-backups-path>


# =============================

if [ -z "$DEST_PATH" ]; then
    echo "[!] You must set DEST_PATH correctly."
    exit 1
fi

if [ -z "$SERVER" ]; then
    echo "[!] You must set SERVER correctly."
    exit 1
fi

if [ -z "$USER" ]; then
    echo "[!] You must set USER correctly."
    exit 1
fi

info_file=$DEST_PATH/last-backup.txt
out=`ssh $USER@$SERVER whoami 2>/dev/null`
if [ "$out" != "$USER" ]; then
    echo "[!] Could not SSH into target server!"
    exit 1
fi

backup_num=0
last_backup=
now=`date '+%Y-%m-%d_%H-%M-%S'`

if [ ! -x last-backup.txt ]; then
    touch $info_file
    echo "[?] Initiating first backup."
else
    backup_num=`sed -n '1p' $info_file`
    last_backup=`sed -n '2p' $info_file`

    echo "[?] Last backup (no. $backup_num) took place on: $last_backup"
fi

echo "[+] Backing up. This will take a longer while..."

backup_dir=$DEST_PATH/$((backup_num % BACKUPS))
if [ ! -x $backup_dir ]; then
    mkdir -p $backup_dir
fi

from=$USER@$SERVER:/

echo -e "\tBackup source dir: $from"
echo -e "\tBackup destination dir: $backup_dir"

rsync -aAXz --rsync-path="sudo rsync" --info=progress2 --exclude={"/dev/*","/proc/*","/sys/*","/tmp/*","/run/*","/mnt/*","/media/*","/lost+found"} $from $backup_dir

echo "[+] Finished syncing. Compressing..."

output_file="backup-$backup_num-$SERVER-$now.7z"
7z a $output_file "$backup_dir/*"
rm -rf $backup_dir

echo "[+] Backup stored at: $output_file"

backup_num=$((backup_num+1))

echo $backup_num > $info_file
echo $now >> $info_file