backing up via rake - problems with habtm tables

I am trying to write a backup/restore rake process and found the very
nice one available on various sites. The problem is that we have a lot
of habtm tables - model1_model2 tables - and they cause the process to
fall over:

Writing g_blocks...
rake aborted!
uninitialized constant GBlocksGSite

Any ideas how to get by this? Obviously this relative data is quite
important!

If you are using MySQL I would recommend taking a look at
AutoMySQLBackup. My company has used it for a couple of years.
(http://sourceforge.net/projects/automysqlbackup/)

Any ideas how to get by this? Obviously this relative data is quite
important!

I the lack of an AR model is causing the problem a possible workaround
might be to create model classes in your backup routine that reference
the HABTM tables.

Aaron