Re: [Duplicity-talk] Multilevel backup

[edgar . soldin]

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