the general question was asked on the forum several times already. would you please be so kind and use the built-in searchfunction of the forum ( in upper right corner of menuebar)
(btw: if you’d upgrade nc20-server to nc21 it would work even smoother)
@aaaa
Must you really migrate all information from the server (e.g. share-link, contacts, …) or do you only want that user migrate their data on their own? If second you can allow the user to use both nextclouds (on the second are only the empty users) and the users migrate their data e.g. with the desktop app.
I think that is a problem. I think you do not get e.g. the links back. You only get back the links if you migrate the old nextcloud to a new server.
You can first read backup and restore for migrating. You can migrate the data and database from your old server to a new fresh server but with the same nextcloud version.
As far as i know, you need to copy the files folder, and you need to backup your DB and restore it on the new server as it was. In addition to this you need to reinstall all applications (as well as copy the configuration of those applications) on the new server, but this should be clear.
Edit: Your data folder normally lays at /var/www/nextcloud/data or /var/www/html/nextcloud/data.
If not you should find it in the config.php of your nextcloud