Install – Nextcloud
https://nextcloud.com/installInstall – Nextcloud Desktop Connect to your Nextcloud from Windows, macOS or Linux. Download for desktop Mobile Use your Nextcloud on the go with our Android and iOS apps. Mobile apps Server Stay in control of your data! Choose one of the providers or download the Nextcloud server for self hosting. Sign up with a provider Download for server
Nextcloud - Official Image | Docker Hub
https://hub.docker.com/_/nextcloudThe Nextcloud installation and all data beyond what lives in the database (file uploads, etc.) are stored in the unnamed docker volume volume /var/www/html. The docker daemon will store that data within the docker directory /var/lib/docker/volumes/.... That means your data is saved even if the container crashes, is stopped or deleted.