I was searching for a simple way to make local backups of my Google Docs and found gdocbackup on Google Code. According to the project docs it runs on Windows and Linux (with Mono) so I tried it on both Windows 7 and Ubuntu 9.10 Desktop.
On the Windows 7 PC, I downloaded the installer from the Google Code project page, installed the application, and ran it. After configuring the backup directory and export formats for the documents I executed the backup and it worked fine.
Running it on Ubuntu took a bit more setup since I did not have Mono installed. First I installed the required Mono packages.
sudo apt-get install mono-runtime libmono-winforms2.0-cil mono-devel
The mono-devel package installs the mozroots utility needed to install a certificate required to access Google Docs (see http://gs.fhtino.it/gdocbackup/faq).
Next I imported the Mozilla root certificates into Mono (see http://manpages.ubuntu.com/manpages/intrepid/man1/mozroots.1.html).
mozroots --import --sync
I downloaded GDocBackup_0.4.9.71_BIN.zip from the gdocbackup project’s Downloads page and extracted it to a GDocBak directory I created in my home directory. I also created a Data directory under GDocBak to hold the backup files. I opened a terminal in the GDocBak directory and ran GDocBackup.exe in Mono.
At this point the GDocBackup application worked the same as in Windows 7. It looks a little different but it downloaded the documents without errors. Now I just need to automate the backups.