Hi! I love the plugin and it works on five of my sites but on two I always get the "Invalid archive." But strangely, only on these two Wordpress blogs. is there a setting to change? All backups (on all sites) have the .gz suffix and winzip handles them correctly, just these two backups are always "Invalid archive directory?" Any idea what makes them special?

The backed-up file is compressed in gzip format, not zip format, so your Windows computer doesn't know how to extract it. You can download a free gzip extraction utility here.

I have uploaded te plugin and activated it successfully .But after taking the backup of the database using the plugin the file that it creates is a zipped file .But i am unable to etract that file as it throws this error 'Invalid Archive directory'