3. WILL MY NEXTCLOUD FILES BE SAFE?
Discussion
If you have space you can run both, but a PI4 is not really good for that. All config files are on your SSD not on the microSDXC UHS-I try it if it works you are fine if not just put your old microSDXC UHS-I back.
After update, you have knots replace core there is no way around this if you have no space.
Thank you!