So I have followed your procedure and everything went well until step 15. i have had an error because drive_manager didn't let me mount the new drive to /mnt/dietpi_userdata/nextcloud_data because the folder was not empty.
I have still restarted the services (step17) and I have decided to edit the /etc/fstab and uncomment the line corresponding to the new drive and write /mnt/dietpi_userdata/nextcloud_data manually.
After remove the USB stick and done a reboot the new drive was mount. I have check with Nextcloud and my data were there and everything is fully functionnal. Great !!!
You should mark your procedure as tutorial for those who would like to change their drive with a similar configuration than mine. thank you very much for your kind cooperation.
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yes that was one of the steps having the potential to fail. I guess the USB stick was not fully unmounted. And indeed changing
/etc/fstabwould be the other option. At the end drive manager is not doing anything else Good that it was working this way at the end.
Pls let us know if a solution is working. This could help others if they hit by similar situation. Your DietPi Team