[K12OSN] Upgrade advice?

[Ron Freidel]

Next week I will be updating two k12ltsp servers, both are 3.1.2-1, I will be
updating to the latest 4.0.1 k12ltsp.

Both servers are also web and email servers, they are both small schools but
the students/teachers actively use them.

My plan is to backup /home, some files in /etc, perhaps the sendmail.cf, and
/var/www then will attempt to do the upgrade.

Would it be advisable to just start fresh? Or will the upgrade work?

Has anyone done this lately? If you did the upgrade, what would you do
differently?

Any advice is most welcome.

Thanks,
Ron