On Sat, Jan 13, 2007 at 03:09:57PM +0800, Tim Post wrote:
>
> That would be cool. Being able to restore one of several dated backups
> for any VM would be ideal, as some people need to revert to yesterday's
> data, or last week's .. or a combination of the two.
>
> If a VM is compromised and defaced, and 20 minutes later a new snapshot
> is taken.. then the backup is useless. Keeping dated backups with a
> selectable retention time per VM would be the ideal goal :)
>
Backups ALWAYS means multiple, and incremental. The idea is to take 7 backups,
all hardlinks to the original. So only the changed files are actually copied,
if the files are same, then just a hard link is made, and if it is different,
automatically the link is broken and a real copy is made. The advantage of
hardlink method is that you need to take full backups ONLY once, and then it is
all incremental. For more info, check this url. It is a must if you are
planning on backing up entire machines.
http://www.mikerubel.org/computers/rsync_snapshots/
Thanks.
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