system_backup

#! /bin/bash

#Usage Function
usage() {
        echo "Usage: [PROGRAM_NAME] [OPTION]"
	echo "Usage: Options: [ -e | Backup Entire System]"
	echo "Usage: Options: [ -r | Backup Entire Remote System]"
}

#Exit Function
exit_func() {
        if [ "$1" -eq 0 ]; then
                echo "Exit 1 --> Success!"
                exit 0
        elif [ "$1" -eq 1 ]; then
                echo "Exit 1 --> Wrong Number of Arguments."
                exit 1
	elif [ "$1" -eq 2 ]; then
		echo "Exit 2 --> Not Connected To/Error Mounting Storage Media."
		exit 2
	elif [ "$1" -eq 3 ]; then
		echo "Exit 3 --> Invalid Option."
		exit 3
	elif [ "$1" -eq 4 ]; then
		echo "Exit 4 --> Error Backing Up System."
		exit 4
        fi
}

#Function That Actually Creates The Backup of The Files Of Your Choosing
backup(){

	path=$(pwd)
	echo "Now Backing Up System..."
	echo "Please Wait (This May Take a While).."
	tar -cpf /path/to/save/location/`date +%F`.tar /* > /dev/null 2>&1 
	execution_check "$?"
}

remote_backup(){

        #Check If Outside Hard-Disk Is Mounted By Checking If You Can List Directory On Remote System, Save Error Result
        ls /path/to/files/on/remote/system/ > /dev/null 2>&1
        result=$?

        #If Hard-Disk Is Not Mounted, Mount/SSHFS To Host, Backup Data, Unmount, Exit
        #If Hard-Disk Is Already Mounted, Backup Data, Unmount, Exit
        #Else, Pring Usage, Exit
        if [ $result -eq 2 ]; then
                sshfs root@"remote IP":/remote/mount/point /local/mount/point
                backup
                umount /local/mount/point
                exit_func 0
        elif [ $result -eq 0 ]; then
                backup
                umount /local/mount/point
                exit_func 0
        else
                usage
                exit_func 2
        fi

}

execution_check() {

        if [ "$1" -eq 0 ]; then
                return 0
        elif [ "$1" -ne 0 ]; then
                echo "Error With Tar Command Up System..."
                exit_func 4
        fi
}

#If Correct Number Of Arguments Run Program
#Else Print Usage And Exit
if [ "$#" -gt 0 ]; then
	create_backup_directory
	while getopts 'er' opt; do
		case $opt in
			e)	backup
				exit_func 0
				;;
			r)	remote_backup
				exit_func 0
				;;
			*)	usage
				exit_func 1
				;;
		esac
	done
else
	usage
	exit_func 1
fi