We have been running NMIS 4 for years, but I think it's time to upgrade. Is there an easy way to do this or is it a painful multi-step thing?
Upgrading from NMIS4 to NMIS8 should be straight forward, the following are the high level steps:
Ideally you should perform a test upgrade on a separate server, but if you have a backup you can roll back your upgrade if you need to.
There are a few other considerations around platforms, e.g. 64bit Linux is recommended for NMIS8, it is likely that you are currently running an older version of 32bit Linux. It is possible to install a brand new NMIS8 server and copy the NMIS4 data and convert it ready for NMIS8, there are a few extra steps than the above.
Opmantek has support services which can assist you to migrate should you need assistance.