Quick Install of Lastest Nightlies - and keep Themes, Java, Plugins

[Peter Lairo]

Hi,

is there a way to easily install the latest nightlies and not have to 
redownload/install JAVA, Themes, PSM and Plugins?

I have tried to just copy the latest nightly files right over the 
installed build and it SEEMS to work.

Is there anything i should be aware of?

Is there a better way (e.g. make backups of \chrome, \plugins, etc dirs 
and then delete old nightly, copy new nightly, then copy \chrome etc 
from backup)??