Sharing and backing up gnucash files on several machines

[Paul Abrahams]

I would like to be able to run Gnucash from any one of several machines.  I 
assume the locking mechanism will protect me from conflicting modifications -- 
that's what it's there for.   I plan to store the data as Dropbox files.  In 
fact, Dropbox itself provides automatic 30-day backup, and for an extra fee 
you can get much more than that.

I know about the .gnucash, .log, etc. files.   But are there other configuration 
files around also that control options and keep track of the data for online 
banking?  If so, where can I find them?