Been trying to get gmvault to do at least one successful run since it showed up on HN maybe a week or so ago. It always stops somewhere at mails from 2008 with no error message, just dies. Guess I'll wait until it's a bit more mature. I only have 6GB of mails too.
Gmvault can fail for multiple reasons, for example Gmail can cut the connection and throttle you for a while.
There are also bugs left or GMail emails that cannot be downloaded (email corruption ?).
For this reason, there is a --restart option for the sync and restore mode (sync being the backup).
The restart mode is a resume mode that will restart the backup or restore near from where it failed.
With that mode you should be able to download your 6 GB on disk.
