Good idea.

Gavin McCullagh wrote:
> Hi,
>
> I'm not sure if this suggestion is well-known already, implemented already
> or maybe just a plain stupid idea that wouldn't work.  So, I'm going to
> suggest it and don my flame-retardant suit.   Feel free to flame or shoot
> it down.
>
> Suppose I do monthly full backups with differentials and incrementals in
> between.  I'd like to hold onto many years of monthly snapshots.  A file
> which is in the backups unchanged the entire time will be duplicated 12
> times each year.  This is kind of wasteful and will be expensive.  What I'd
> prefer to do is keep a series of full backups (say 6 months worth) and keep
> monthly incrementals or differentials which allow me to get back to earlier
> snapshots.
>
> I think this might be doable by, every month, running a (new?) type of
> migrate job which takes the oldest two full datasets (fb_t0 and fb_t1) and
> creates an incremental dataset (ib_t1t0) which, applied to fb_t1 would give
> the older dataset.  You would then recycle the fb_t0 dataset but the full
> data would still be available via the incrementals.  A month later the same
> process would happen with fb_t1 and fb_t2.  fb_t0 would then be available
> via fb_t2, ib_t1t0, ib_t2t1.  Over the years, making your way back to the
> start would become a longer and longer process, but at least it would still
> be possible.
>
> This seems somewhat similar to the new virtual backup feature (which is a
> brilliant one, might I add).
>
> All suggestions, corrections and criticisms welcome,
>
> Gavin
>
> PS if further background is required, see the first three paragraphs of
> this earlier thread.
>
> http://www.mail-archive.com/bacula-users AT lists.sourceforge DOT 
> net/msg36365.html
>
>
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