This is probably blindingly obvious to someone with computer/linux skills but I can't figure it out. 

I'm adding alot of info to my Alexandria program weekly, sometimes daily. Where in ubuntu linux (hardy) are the alexandria
files stored so that I may back them up to an external harddrive?

Properties feature of alexandria is not enabled, for most programs that tells me where the program and it's files are
located.

There is nothing in the contents file about backing up data. 

If I export my data as an ISBN file, can I then re-import it as isbn file if I need to re-load my data?

Can info on how to backup data please be put in the next content update? thanks

Date: 2009-03-18 03:50
Sender: Cathal Mc Ginley

Actually, adding an option to export your books into an
alexandria-native-format tar.gz would be a nice feature. Either
as an export option, or from the command line; something like:
alexandria --back-up-libraries
... which would create a timestamped tar.gz or some such.

This would be very useful for backing up before upgrading too,
and should be a simple feature to add.

Date: 2008-10-17 14:56
Sender: Cathal Mc Ginley

The proper thing to do is to back up the .alexandria directory
in your home directory.That contains all the book details, cover
pictures, and settings for the program. I was sure this was mentioned
somewhere in the help files, but I'll add it if it's not. To
recover dat, you just need to replace the .alexandria directory
with the backed up version. It should be as simple as this:

#backup
cd
tar zcvf alexandria-backup.tar.gz .alexandria

#restore
cd
tar zxvf /media/external/alexandria-backup.tar.gz

I don't know what you mean by the "properties feature"...
can you describe a program which has the kind of feature you're
looking for?