bash script to backup directory to usb drive

better_backup

#
# important! cannot use this program to backup itself ->$HOME/bin
# script to backup directory to usb drive mounted to bobsUSB
#
# first make sure file is used as argument

if [ ! -d "$1" ]
then
  echo "usage: better_backup mydir"
  exit 1
fi

# first check if bobsUSB is mounted

if [ $(mount | grep -c /mnt/bobsUSB) != 1 ]
then
  sudo mount -o uid=pi,gid=pi /dev/sda1 /mnt/bobsUSB || exit 1
  echo "/mnt/bobsUSB is now mounted"
else
  echo "/mnt/bobsUSB is already mounted"
fi

# make tarball of directory and move it to bobsUSB
now=$(date +"%m_%d_%Y")
# strip slashes
name=${1##/*/}
_file="$name$now.tar.gz"

echo "creating backup of $_file..."

tar -czvf $_file $1 || exit 1
mv $_file /mnt/bobsUSB || exit 1

echo "success!"