I am running the server in a docker container on my TrueNAS server
The compose is configured like:
services:
urbackup:
image: uroni/urbackup-server:latest-zfs
container_name: urbackup
restart: unless-stopped
privileged: true
user: "0:0"
environment:
- PUID=0
- PGID=0
- TZ=Europe/Berlin
- ZFS_IMAGE=Crumblr/backups/images
- ZFS_FILES=Crumblr/backups/files
volumes:
- /mnt/Crumblr/configs/urbackup/db:/var/urbackup
- /mnt/Crumblr/backups:/backups
network_mode: "host"
devices:
- /dev/zfs:/dev/zfs
post_start:
- command: "zfs mount -R Crumblr/backups/images"
user: root
- command: "zfs mount -R Crumblr/backups/files"
user: root
And it starts and runs without issues. And I am able to reach the webui under:
192.168.178.111 is the local IP of my nas …
And my windows 10 client (Version 2.5.30) is connected via:
ws://192.168.178.111:55414/socket
However when I try to start a backup of files or images from the server. It immediatly shows “Starting backup failed”
And there are logs nowhere to be seen. Neither on client or server. Even tough I EXPLICITLY set the log level to debug…
(docker logs)
[urbackup] 2026-04-25T20:49:54.291855512Z 2026-04-25 22:49:54: WARNING: Shutting down (Signal 15)
[urbackup] 2026-04-25T20:50:02.137279307Z usermod: no changes
[urbackup] 2026-04-25T20:50:03.784746659Z TEST FAILED: guestmount is missing (libguestfs-tools)
[urbackup] 2026-04-25T20:50:03.938171249Z Testing for btrfs...
[urbackup] 2026-04-25T20:50:03.940079352Z TEST FAILED: Creating test btrfs subvolume failed
[urbackup] 2026-04-25T20:50:03.940135643Z Testing for zfs...
[urbackup] 2026-04-25T20:50:05.800108172Z Destroyed subvol Crumblr/backups/images/testA54hj5luZtlorr494 successfully.
[urbackup] 2026-04-25T20:50:05.800154546Z ZFS TEST OK
[urbackup] 2026-04-25T20:50:06.982194412Z Destroyed subvol Crumblr/backups/files/testA54hj5luZtlorr494 successfully.
root@truenas:/# cat /etc/default/urbackupsrv | grep LOGLEVEL
LOGLEVEL="debug"
root@truenas:/# cat /var/log/urbackup.log
2026-04-25 22:49:54: WARNING: Shutting down (Signal 15)
root@truenas:/#
My client also shows connected, but the icon is still red and missing more context options?
I am at my limit and have been trying since yesterday to get this to work. But to no avail.
I have already reinstalled the windows client like 5 times and I always end up in the same place …
PLEASE HELP!