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how can I sync 2 almost identical disk after dd [Resolved]

Lets say I have /dev/sda and /dev/sdb.
Before, I run dd if=/dev/sda of=/dev/sdb bs=128M, and it succeeded.

Then after some time, there is update on first disk, and I want to clone it to second disk. But I don't want to run dd from beginning, because ... well it takes time.
Any solution to update on the /dev/sdb without dd'ing from start?

UPDATE : the disk actually is ntfs, so rsync is not a solution. Also, I want the second disk to be bootable like the source disk, using rsync would break so many things.

Question Credit: Rinaldo Jonathan
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Asked May 29, 2019
Tags: dd
Posted Under: Network
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