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Re: [Duplicity-talk] Concept and how to combine incremental and full bac
From: |
Scott Hannahs |
Subject: |
Re: [Duplicity-talk] Concept and how to combine incremental and full backups to save space |
Date: |
Thu, 17 Mar 2022 10:21:56 -0400 |
Yes, you can use the " --full-if-older-than” option to automatically initiate a
new full back up. You can limit the storage to only keeping 1 full backup with
the "remove-all-but-n-full 1” command.
HOWEVER, it is logically impossible to do a second full backup if there isn’t
space. The only other method is removing the old backup first and then doing a
new backup. But if that new backup fails for any reason you are SOL so it
isn’t a good idea. For security of your backups you should have enough room
for two full backups and a bunch of incremental.
As a suggestion, using an offsite commercial service can give you that
flexibility without too much cost. I use Wasabi and pay about $4/month/TB. I
have no interest in the Wasabi company other than a customer. Once I set up
the buckets and the S3 connection it has pretty much run on its own. I do a
full backup every 30 days and nightly incremental.
-Scott
> On Mar 17, 2022, at 4:41 AM, c.buhtz--- via Duplicity-talk
> <duplicity-talk@nongnu.org> wrote:
>
> Hello together,
>
> I am sorry for asking because I assume the answers are still out there. But I
> wasn't able to find the needed information's or I wasn't able to understand
> them and bring them together in my head.
>
> In the duplicity docs it is recommended to not make the chain of incremental
> backup's to long. Make it one month and then do a full backup. OK, I
> understand why.
> Technically I do not know how to "implement" this. Can I combine
> switches/options that way that I only need one duplicity call and duplicity
> decide itself if it has to do a incremental or full backup?
>
> Currently I call duplicity with this (folders replaced by placeholders):
>
> duplicity SOURCE_FOLDER file:///DESTINATION_FOLDER --no-encryption --progress
> --verbosity INFO --volsize 500
>
> I have very limited space on the destination. I think I am not able to hold
> two full backups there. I only can have one full backup at time.
>
> This is my current collection status where I have one (old) full and lot of
> incremental.
>
> Last full backup date: Fri Dec 3 09:44:22 2021
> Collection Status
> -----------------
> Connecting with backend: BackendWrapper
> Archive dir: /home/user/.cache/duplicity/50d0997d52a684176de033baca98f9f0
>
> Found 0 secondary backup chains.
>
> Found primary backup chain with matching signature chain:
> -------------------------
> Chain start time: Fri Dec 3 09:44:22 2021
> Chain end time: Thu Mar 17 09:23:28 2022
> Number of contained backup sets: 26
> Total number of contained volumes: 50
> Type of backup set: Time: Num volumes:
> Full Fri Dec 3 09:44:22 2021 25
> Incremental Fri Dec 3 10:25:03 2021 1
> [snipped 20 incrementals]
> Incremental Tue Mar 8 08:45:37 2022 1
> Incremental Thu Mar 10 11:25:11 2022 1
> Incremental Wed Mar 16 17:41:44 2022 1
> Incremental Thu Mar 17 09:23:28 2022 1
> -------------------------
> No orphaned or incomplete backup sets found.
>
> There is definitely not enough space to create a second full backup. Maybe I
> can transform the incremental's into a second full so that there are no
> incremental's anymore consuming space. When I have two fulls I can delete the
> older one and go on with new incremental's (for one month). Is this a good
> plan? :)
>
> Kind
> Christian
>
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