Update from 1.8.8 to 1.8.10 on Mandrake 10.0

[Donna and Doug]

I've been using GnuCash for about a year (love it, sent $$ I love it so 
much).

I see that 1.8.10 is out and found an RPM package for Mandrake 10 but 
want to make sure I do this right (hate to kill my accounts for the sake 
of an upgrade).

First - data safety:
I can find no information about the best way to upgrade - backup vs 
export (and if it is an export, is there some file extension I should 
use - the export seems to use whatever filename you type in and adds no 
extension that I can find).

Second - the process:
Will the 1.8.10 RPM automatically replace the 1.8.8 install or will I 
have two full installs, one with data (my 1.8.8) and one virgin install 
(the 1.8.10) that will need to be populated with my current data?  If 
the 1.8.10 is clean, what's the recommended method to pull my current 
data into the new install?

Most apps I am comfortable just taking a chance on the install - if I 
break an audio app, no biggie, just kill everything and start over.  I 
do NOT want to hose up my checking/savings data.  Moving from Quicken to 
GnuCash was a non-trivial task and I don't want to start over again.

If I missed the 'how to', please just let me know the URL and I'll go 
get the info myself (teach me to fish...)

Thanks in advance for the advice and pointers.

Doug