Moving data off truenas to another device externally to transfer to new nextcloud on the

I need to move my files/data from nextcloud to hold externally until I can rebuild a new nextcloud on the same device. I will be reinstalling truenas. If i reset/reinstall truenas the files will be lost becasuse the hard drives will be re-formatted…is there a way to do this transfer so I can build up the server again?

follow backup/restore/migration procedures:

Can’t access the webserver to use the migration tool, it stuck on this page. Any solutions?

press [start update]

This is the result of starting the update.

Please use the search this question was asked lot of times already.