bak

#!/usr/bin/env bash

# Names of backup disks
DISK=( MacOSX2 Seagate3TB ZwartUSB )

# Check which backup disk is mounted
DEST=
for VOL in "${DISK[@]}"; do
	FOUND=$(mount | grep -c " on /Volumes/$VOL (")
	[ $FOUND -eq 1 ] && { DEST="$VOL"; break; }
done
[ -z "$DEST" ] && { echo 'No backup disk found.' 1>&2; exit 1; }
echo "Using backup disk: $DEST"

# Double check if directory actually exists
DEST="/Volumes/$DEST"
[ ! -d "$DEST" ] && { echo "Directory not found: $DEST" 1>&2; exit 2; }

# Test if I am root
U=$(whoami)
if [[ "x${U}x" != "xrootx" ]]; then
	N=$(basename "$0")
	echo "This script needs to be run as root. Use: sudo $N" 1>&2
	exit 3
fi

# Copy application directory to backup disk
echo
echo "   Applications:"
echo
rsync -au --exclude='.DS_Store' --info=progress2,stats3 /Applications "$DEST"

# Copy System Library to backup disk
echo
echo "   Library:"
echo
rsync -au --exclude='Caches' --exclude='.DS_Store' --info=progress2,stats3 /Library "$DEST"

# Copy some root directories to backup disk
echo
echo "   Miscellaneous root dirs:"
echo
rsync -au --exclude='.DS_Store' --info=progress2,stats3 /bin /sbin /private /usr /opt "$DEST"

# Copy contents of Users directory to backup disk
echo
echo "   Users:"
echo
rsync -au --exclude='Caches' --exclude='.DS_Store' --info=progress2,stats3 /Users "$DEST"