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From: | zga9uhnq4g |
Subject: | Re: [Duplicity-talk] Multilevel backup |
Date: | Fri, 25 Feb 2022 17:00:42 -0800 |
User-agent: | Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.6.1 |
hey Peter,
i tried to understand what rdiff-backup does by reading, but do not seem to grasp it. being short on time to try it out, could you maybe explain in more detail?
thanks ..ede/duply.net
On 23.02.2022 06:36, zga9uhnq4g--- via Duplicity-talk wrote:
Another way to avoid long backup dependency chains might be to do what rdiff-backup <https://rdiff-backup.net/> 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,currently no.
I am wondering if it is possible to do multilevel backup with duplicity?
(In order to avoid the long backup chains, without having to frequent full new backups.)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.
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).
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.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
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
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