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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 upgrade Stirling-PDF to 3.0 with Docker without losing data

Stirling-PDF 3.0.0 upgrades in Docker by changing the image tag: users, settings, API keys and watched folders survive. But 3.0 adds a 1,000 PDFs per month meter for the API and automations, which answers with a 402 error once it runs out, and it needs a new volume for /storage.