Backup/ Restore of file system or partition.
#dump -ouf boot.dump /dev/vda1 Or /boot
o : full backup
u : update
f : file
Restore the dump backup
#restore -rf boot.dump
extra : need to install dump package and take backup of path where suffienct free space is available.
create hard disk backup
#dd if=/dev/sda of=/mnt/sdabackup