[Discuss] rsnapshot vs. rdiff-backup

[abreauj at gmail.com (John Abreau)]

Interesting That explains the behavior I observed that motivated me to roll
my own script for handling weeklies, monthlies, and yearlies.


On Thu, Dec 5, 2013 at 11:24 PM, Edward Ned Harvey (blu)
<blu at nedharvey.com>wrote:

> > From: Derek Atkins [mailto:warlord at MIT.EDU]
> > Sent: Thursday, December 05, 2013 2:11 PM
> > To: Edward Ned Harvey (blu)
> > Cc: John Abreau; Jerry Feldman; BLU Discuss
> > Subject: Re: [Discuss] rsnapshot vs. rdiff-backup
> >
> > "Edward Ned Harvey (blu)" <blu at nedharvey.com> writes:
> >
> > > With my configuration, I get snapshot dates as follows:
> > >
> > > Nov  2 01:00 weekly.3/
> > > Nov  9 01:00 weekly.2/
> > > Nov 16 01:00 weekly.1/
> > > Nov 23 01:00 weekly.0/
> >
> > Why is your weekly.0 more than a week out of date?  I would've expected,
> > based on the numbers, that your weekly.0 would be on Nov 30th.
>
> That's right.  Once an hour, my system creates a new hourly.  But *all*
> the hourlies are later than the latest daily.  Once a night, it takes the
> oldest hourly, and renames it "daily.0" instead of deleting it.  And it
> renames all the dailies += 1.  But *all* the dailies are later than the
> latest weekly.  Once a week, it takes the oldest daily, and renames it
> "weekly.0" instead of deleting it.
>
> While I acknowledge this might not be super intuitive, it is
> programatically very easy, (which is the reason they do it) and it works to
> effectively create finer granularity in recent times, and coarser
> granularity in progressively older times.  At any given time, my latest
> weekly will be 1-2 weeks old, no more and no less.  (I could be wrong, it
> might be 8-15 days old because of my latest hourlies) ...
>
> I was responding to Jerry saying "the most recent weekly was several weeks
> old" which would not occur for most people, using something of a standard
> configuration.
>



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John Abreau / Executive Director, Boston Linux & Unix
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