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How is dump invoked (fifth field of /etc/fstab), can I replace dump?

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Everyone says that the fifth field of an entry in /etc/fstab should always be 0 because otherwise dump would be used and nobody likes dump because it's old, only supports ext2 and ext3, does not meet modern backup needs and is often not even installed anymore.

From what I have read so far it seems that dump was something that usually was invoked manually or with crontab. Is there a good reason not to have my own script called dump and have it check the fifth field in /etc/fstab and let it do a backup routine of my choice?

Is the fifth field in /etc/fstab doomed to be useless?

Here is what I have read so far:

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