NetBSD disk backup over network

[Sergey Babkin]

>From: Bernd Walter <ticso at cicely12.cicely.de>
>> >From: Ashley Moran <work at ashleymoran.me.uk>
>> 
>> >I just saw this slashdotted article: 
>> >http://ezine.daemonnews.org/200603/dermouse.html
>> 
>> Well, I've been running around with this kind of idea for
>> around 10 years now. Never actually implemented it though.
>> I can't quite believe that encryption at full disk speeds
>> makes no noticeable CPU overhead.
>
>This sounds as nothing more than a mirror with one disk beeing a remote
>file.
>And this is not really a new idea - remote mirror has a long standing
>tradition.
>You can already configure these things with GEOM right now.
>But this is in no way a backup, this just saves you from disk failures
>which is the purpose of a mirror.
>What is missing is history in the remote image so that one can access
>older contents.

You can easily save the stream of updates as a redo
log (well, that's the idea I've been running around with).
Then you can roll forward from the full backup points using
this log, and also use it for online backups while
the operations are still running. Of course, it would 
probably require an fsck to get things actually mounted.
My impression from the article was that he had this thing 
as well.

-SB