Error during data migration from Nextcloud server to AIO

Hello,
i have a nextcloud server on Raspberry PI 4 and i would like to switch to AIO version.
The AIO v9.5.1 installation seems OK with this command :
sudo docker run --init --sig-proxy=false --name nextcloud-aio-mastercontainer --restart always --publish 80:80 --publish 8080:8080 --publish 8443:8443 --env NEXTCLOUD_DATADIR=“/web/nextcloud_data” --volume nextcloud_aio_mastercontainer:/mnt/docker-aio-config --volume /var/run/docker.sock:/var/run/docker.sock:ro nextcloud/all-in-one:latest

I have created the old user accounts from the admin panel.

When i try to migrate migrate only files as suggested here (all-in-one/migration.md at main · nextcloud/all-in-one · GitHub), i got errors :
sudo docker cp --follow-link /web/nextcloud/data/. nextcloud-aio-nextcloud:/web/nextcloud_data/ Successfully copied 295kB to nextcloud-aio-nextcloud:/web/nextcloud_data/
Error response from daemon: Could not find the file /web in container nextcloud-aio-nextcloud
time=“2024-09-14T22:14:41+02:00” level=error msg=“Can’t add file /web/nextcloud/data/xxxx/files/xxxx/xxxxx.jpg to tar: io: read/write on closed pipe”
time=“2024-09-14T22:14:41+02:00” level=error msg=“Can’t close tar writer: io: read/write on closed pipe”

From this point, i don’t understand what’s going wrong. Do you have any clues ?

Can you compare this one with the one in step 5 of the guide?

Thank you, now i understand what is /mnt/ncdata :slight_smile:
I’m going to see next steps