Self-host your own cloud: a practical Nextcloud guide

Moving your files off a public cloud is less about ideology and more about control: who can read your data, where it physically lives, and what happens if a provider changes its terms. Nextcloud gives you the same core experience — sync, share, calendars, contacts — on hardware you own.

Size it for your data, not just your users. Nextcloud's RAM needs scale with concurrent users, but its disk needs scale with your files. Decide your storage target first and attach enough disk; growing later is easier if user files live on a separate volume from the application code.

Use the right database and cache. MariaDB or PostgreSQL plus Redis. The Redis cache is not optional if you care about performance — it also prevents the notorious file-locking errors that appear on busy instances.

Plan your backups before you migrate. You need both the database (metadata) and the file directory. Back up the two together, and keep a copy off the server. Test a restore at least once; an untested backup is a hope, not a plan.

Think about document editing. If you want to edit Office files in the browser, add a Collabora Online container. That raises the RAM requirement, so size accordingly.

Secure it properly. Force HTTPS, enable two-factor authentication for accounts, and keep the server patched. Because your data is concentrated here, this server deserves more care than a throwaway test box.

Done well, a self-hosted Nextcloud is invisible in daily use — files sync, calendars update, shares work — except that you know exactly where everything lives.