How migrate nextcloud pi to 64bit on Raspi 4?

Hello there,
how can I upgrade my nextcloud pi installation (installed mid 2020 frequently updated to actual version) to the new 64bit version. I found a upgrade-thread but it relies on that data is stored on an external device.

Is it possible to simple do a data-backup out of nextcloudpi then install the new image on the SD-card an play the backup back? Or are there any gliches doing that?

I am running a Raspberry 4B 1GB and use nextcloud only as sync-server for calendar, tasks and contacts between my Mobile phone, tablet, PC and Notebook.

Thanks for help and advice,

Yes, the backups are compatible.
(now also mentioned in How to backup and restore a NextCloudPi instance using ncp config )

Trying searching the forum.