mount backup drive:

sudo mount -t ntfs /dev/sdc1 /mnt/backup

test it:

sudo rsync --dry-run -avv /etc /mnt/backup/

back it up:

sudo rsync -avv /etc /mnt/backup/ sudo rsync -avv /home /mnt/backup/ sudo rsync -avv /mnt/library /mnt/backup/

unmount backup and eject drive:

sudo umount /mnt/backup hdparm -Y /dev/sdc echo 1 > /sys/block/sdc/device/delete