continuous backup solution for FreeBSD

[Oliver Fromme]

Zaphod Beeblebrox wrote:
 > Oliver Fromme wrote:
 > > However, ZFS does exist on FreeBSD, and I think it wouldn't
 > > be impossible to add similar features to ZFS.
 > 
 > Possibly even as a ZFS module?  This might  be something better addressed at
 > the ZFS project level --- but the next question is: does FreeBSD support ZFS
 > modules?

I'm sorry I don't know.  But also see my other reply
regarding ZFS snapshots ans "zfs send".

 > > Another possibility would be to extend gjournal by adding
 > > time stamps to journal transactions and a possibility to
 > > feed the journal to a pipe, socket or whatever.  And of
 > > course a client-side implementation that does something
 > > useful with the journal stream.  This might even be a good
 > > SoC project.
 > 
 > Now this interests me.  Firstly, I thought that gjournal might only be
 > responsible for the meta-data (but I'm happy to be wrong on this point).

Nope, gjournal handles _all_ data, i.e. meta data and file
contents.

 > Secondly, is it a) sufficient and b) efficient to attempt to time-travel UFS
 > with the gjournal log?

I almost don't dare to mention DragonFly BSD again, but
they do have a UFS journaling implementation that does
exactly that:

http://leaf.dragonflybsd.org/cgi/web-man?command=mountctl
http://leaf.dragonflybsd.org/cgi/web-man?command=jscan

However, I think the implementation was abandoned because
it was obsoleted by the development of the HAMMER file
system.  But the basic functionality is there and works.

Best regards
   Oliver

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