The decision
Map data files, database, configuration and custom components before calling an application copy a backup.
A bounded example
Use the application’s documented maintenance procedure where needed and test a recovery on a separate target.
Documentation
Use the relevant version of Nextcloud — Backup before changing a live service.
Checks before change
Keep a recovery route, work on an isolated copy when data is affected, and record observations rather than assumptions. Stop if an acceptance check fails.
Limits
Hoszen does not preinstall or operate applications, hold secrets, verify backups, promise capacity or confirm a payment or VPS delivery.