Re: [Duplicity-talk] Multilevel backup

[zga9uhnq4g]

    Another way to avoid long backup dependency chains might be to do
    what rdiff-backup
    does.  It uses reverse diffs so the current backup is just a copy of
    the source directory, but older increments are "reverse diffs". 
    This makes it always possible to delete the oldest N backups because
    nothing depends on them.
    
    I've always wondered why duplicity doesn't work that way (encrypted
    of course), but I assume there is a good reason (which I would love
    to hear).  I wonder if it could be an option.
    
        Peter

On 2022-02-22 03:32, edgar.soldin--- via Duplicity-talk duplicity-talk-at-nongnu.org |duplicity-talk| wrote:

> hi Hakan,
>
> comments inline
>
> On 21.02.2022 20:39, Håkan T Johansson via Duplicity-talk wrote:
> > Hello,
> >
> > I am wondering if it is possible to do multilevel backup with duplicity?
> >       
> currently no.
>
> > (In order to avoid the long backup chains, without having to frequent full new backups.)
> >
> > If not, I suppose what would be needed would be an option to base some incremental backups on not the latest incremental but an earlier one (or the full backup).
> >       
> the easiest implementation would probably be a way to base a new chain on a previous full. maybe via dummy full volume/metadata file, that just points at the old one.
>
> > What I'm contemplating is to e.g. let the first backup every month be incremental based on the previous month's first backup.  And the same for weeks and days, with the first within each category either based on the previous such, or the latest of any category higher, if that is later.
> >
> > Together with e.g. remove-older-than 14D, this could give a chain-tree like this (each backup based on the previous line, unless there is an arrow):
> >
> > full
> > monthly
> > monthly
> > monthly
> > monthly
> > ^ weekly
> > | weekly
> > | weekly
> > | weekly
> > | ^ daily
> > | | daily
> > | | daily
> > | | daily
> > | | daily
> > | | daily
> > | weekly
> > |   daily
> > |   daily
> > monthly
> >   ^ daily
> >   | daily
> >   | daily
> >   weekly
> >     daily
> >     daily
> >     daily
> >
> >       
>
> much to complex for my taste. apart from that good luck finding someone to implement it. feel free to offer to contribute it though :) ..regards ede/duply.net
>
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