I think there is some misunderstanding here about what is supported and what is 
possible.

 - Any old filesystem client should run with a newer NW server/SN. To the best 
of my knowledge, this is a mandatory key demand.
   Do not forget that you might not be able to upgrade a client do to 
client-site compatibility issues. So do you delete him from the data zone? - of 
course not!
   However, EMC will not test all possible combinations. Consequently, EMC will 
not support it.

 - Some NW modules however demand the installation of the latest NW client 
version (see screenshot). For instance NMM 2.4.1. It clearly states it when 
your client SW is older.

 - Technically, i do not see a problem to update server/SN from any older NW 
version (at least not since 7.3).
   Today i tested a direct upgrade on an fresh installed NW 7.4 (no NMC) 
version to 8.0.1 without any problem. I admit the DBs were empty but i do not 
see a technical issue here.
   Once again, EMC has not tested it an will therefore not support it.

If you are in doubt, just copy your NW server and test it (more thoroughly than 
i did). 
Hey - it's NetWorker! - It uses the same databases for years. What can really 
go wrong?


 (http://postimage.org/image/xhzp28jvl/)

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