Install armbian in different disk

[Fernando Castillo]

HI!! I need help. What is the correct way to install armbian? I have an odroid m1, with a nvme 2 TB. I installed armbian and also stored my files on the same disk. The problem is that one day I updated the system and also updated the kernel. This caused the system no longer boot. I tried to fix the file system but it is still corrupt. The problem is that the nvme where I have all my files is not accessible and therefore I cannot copy them to another drive. When I mount the nvme drive (with external case) on my laptop  with Ubuntu, the files do not appear. Therefore, I would like to know if where is the best option to install armbian and and mantaining safe mu files. In the future I want to use the sata port to add another disk, so I couldn't install armbian there either. Do you recommend installing a USB3 pendrive and installing Armbian there? Is it very slow that way? The other thing, how can I recover my nmve data? Thank you very much for the help