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From: Greg Black <freebsd-nospam@yaxom.com>
To: "Mikhail T." <mi+thun@aldan.algebra.com>
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Cc: Daniel O'Connor <doconnor@gsoft.com.au>, freebsd-stable@freebsd.org,
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Subject: Re: dump | restore fails: unknown tape header type 1853384566
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On 2009-03-24, Mikhail T. wrote:
> That's true. I just wanted to point out, that someone running dump only 
> (to make backups) is not going to know, whether his dumps are usable 
> (for whichever of the two reasons), until he needs them...

Such a person is not making backups and deserves what he gets.

I haven't got anything to say about dump/restore because I haven't
bothered with them for years.  I do know that dumps from mounted file
systems will often appear to work, but will fail when it matters.  This
is not a bug and is expected behaviour to which the solution is obvious.