So here is my setup.
Here are my questions:
Why I do this:
- This lockdown is driving me crazy. 
Can I do an upgrade to OMV 5 without reinstall?
Yes but there may be issues since it isn't officially supported - RE: OMV 5.0 - finally out! :-)
ny precautions I need to take before upgrade?
How can I restore in case I mess up
clone the SD card with win32diskimager or dd first. If the upgrade goes bad, just write the backed up image back to your sd card.
I upgraded from omv 4 to omv 5 a few weeks ago. The board is a NanoPi M4 with Armbian Linux 4.4.192-rk3399
But first make an SD card backup as ryecoaaron recommends.
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