There is no backup/restore implementation in Omv unfortunately. It is highly recommend that omv3 gets installed from scratch, an upgrade is viable for experienced users/admins/devs in Debian/Omv that know how to fix apt and db errrors.
Also I recommend that if you take the clean install or upgrade either way, clear your browser cache before starting to reconfigure elements in the webui.
Ok, I am experienced 
(no, really). but I really just need the users/passwords. are they only debian style in passwd/shadow or are they somehow synced into the OMV settings files?
You can keep the passwd/shadow but if I am. Not mistaken there are some users and groups specific to systemd. Also shadow is also valid for Pam login, samba uses own passwd db. Maybe you should keep that also. I don't know if is transferable by the way that file. Usually Omv sets the users os password and samba at the same time.
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