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How to upgrade Nextcloud to version 35 with Docker without losing data

To upgrade Nextcloud 34 to 35 in Docker, back up the database and the volume, switch the image to nextcloud:35 and let the container start run occ upgrade. You can only move one major version at a time. What breaks are apps with no release for 35, and going back to 34 means restoring the backup.

Tools

How to Install Nextcloud with Docker

Nextcloud is an open-source private cloud platform that, in Docker, runs as three containers: the application, a MariaDB database and a Redis cache. With a single docker-compose.yml file you get your own self-hosted Drive, calendar and contacts in minutes, with your data stored in a volume that you control.