Backup size is negligible after the first run. Also, how to retore I I did refresh installation

Hi All,
I am new to Duplicati. I installed and ran the backup job. It created ~27MB file during the first run. Second and third run are creating in KB size files only.

  1. I expected every day the file size going to be increasing/similar. Is it capturing only the changes?

  2. In case if my Ubuntu server fails and I end up re-installing Duplicati, how it knows I have the backups in my google drive? Now the current version automatically shows I have two backups. If I do fresh install and connect to my google drive, will it recognize on its own?

  3. I installed using Portainer on a docker. It shows permission denied for few folders. How to rectify the permission issues when the backup is run? Looks like it is skipping them now.

2024-05-16 05:00:41 +00 - [Warning-Duplicati.Library.Main.Operation.Backup.FileEnumerationProcess-FileAccessError]: Error reported while accessing file: /source/nginx/letsencrypt/accounts/
UnauthorizedAccessException: Access to the path ‘/source/nginx/letsencrypt/accounts’ is denied.
2024-05-16 05:00:41 +00 - [Warning-Duplicati.Library.Main.Operation.Backup.FileEnumerationProcess-FileAccessError]: Error reported while accessing file: /source/nginx/letsencrypt/accounts/
UnauthorizedAccessException: Access to the path ‘/source/nginx/letsencrypt/accounts’ is denied.

Welcome to the forum @SelfhostCJ

Yes. Details from the user manual:

Features

Incremental backups
Duplicati performs a full backup initially. Afterwards, Duplicati updates the initial backup by adding the changed data only. That means, if only tiny parts of a huge file have changed, only those tiny parts are added to the backup. This saves time and space and the backup size usually grows slowly.

which is odd because you started three runs, but maybe the second was interrupted before finish?
A given run should upload a number of dblock/dindex file pairs, and a dlist file at end listing content.

If it’s just the install, it should use the same local database. If new system, move old DB or recreate.

What Docker? Duplicati’s runs as root, so should have good access to files. LinuxServer’s does not.

UserName in About → System info can give you clues on access issues. Or look using docker exec

Thanks for the reply.
It shows only two versions in the Web even though it created files every day in my google drive. Web has initial (two days back) and latest version (today). But yesterday it had an initial and yesterday version.

I used the smart backup option. it was supposed to create backup for 7 days, 4 weeks and 12 months. Not sure on the exact thing, but something similar to this it was supposed to create as per the options I had chosen.

Yes, I am running this through Docker not as direct app. Installed using docker compose and mapped the source and backup locations as volume. But in web used google drive as backup location.

Anyway to specify or run it as root so that it doesn’t have folder permission issue. The warning log shown it had issue with Letscrypt folder under nginx. It is system protected and my login ID doesn’t have access too. But as Duplicati is supposed to backup everything, how to give super access to this to avoid missing files in my backup.

Not exactly. See the “one backup” note:

So if you take too many backups per day, something will get deleted to leave a density of one per day.
Your May 16 backup might have been less than 24 hours from your May 15, so therefore was deleted.
This should all be in the job log, for example:

image

The current screenshot shows some files, but not a dlist, which represents a backup version, and then

shows that it used to be there, so look at third backup log to see if it deleted second. That deletes a dlist.

If you want to keep multiple backups per day for awhile, set a custom backup retention however you like.

image

It doesn’t create backups. It controls how created backups are deleted.
Flipping that over for labeling, it’s how the created backups are retained.
Creation is manual or on the Schedule screen.

Which Docker? See above for some guesses.

This depends on the Docker, and the one Duplicati ships runs as root. If LinuxServer, see its Usage:

    environment:
      - PUID=1000
      - PGID=1000

is probably what controls how it runs. I don’t use Docker, but you do. Maybe this article will also help.

Understanding PUID and PGID

If that won’t get you there, there’s a lot more information on the web about how to handle LinuxServer.

Fishing around (because I don’t use Portainer either), maybe some of these items will help get to root:

Advanced container settings

Env might let you set PUID and PGID, and it sounds like many images willl run according to the values.

How does PUID/PGID actually work in docker

Wow. Thanks. Impressed with your line-by-line response :slight_smile:
Below is my composer file that I used inside Portainer. While searching through the forum, someone mentioned they manually added folder permission. But I don’t want to do as the folder is set with limited access for my current user for a reason as it contains certificate files etc.


services:
duplicati:
image: lscr.io/linuxserver/duplicati:latest
container_name: duplicati
environment:
- PUID=1000
- PGID=1000
- TZ=Etc/UTC
- CLI_ARGS= #optional
volumes:
- /home/sparky/SparkyApps/duplicati/config:/config
- /home/sparky/SparkyApps/backups:/backups
- /home/sparky/SparkyApps:/source
ports:
- 8200:8200
restart: unless-stopped

Although I don’t run Docker, that looks like LinuxServer, and if you want to change it there, Docker says:

environment

EDIT:

and put that together with the “Understanding” link, and you can possibly either edit or delete those lines,
getting back to default root behavior before they tried to make life a bit safer while hurtng backup access.

Thanks for your help. I updated the composer file with 0 UID that turns duplicate to run using root account. Now it doesn’t show any warning finally.

Thanks a lot for all your help.

services:
  duplicati:
    image: lscr.io/linuxserver/duplicati:latest
    container_name: duplicati
    environment:
      - PUID=0
      - PGID=0
      - TZ=Etc/UTC
      - CLI_ARGS= # optional
    user: "0:0"
    volumes:
      - /home/sparky/SparkyApps/duplicati/config:/config
      - /home/sparky/SparkyApps/backups:/backups
      - /home/sparky/SparkyApps:/source
    ports:
      - 8200:8200
    restart: unless-stopped

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