Backup Failed

Hi there, I have encountered a problem when backup the virtualmin virtual server. The log didn’t show any useful error message. I have tried to change temp directory but still no luck. Would anybody like to help ? Thanks a lot.

Here is the log:

Copying virtual server configuration …
… done
Backing up Cron jobs …
… none defined.

Copying records in DNS domain …
… done

Saving mail aliases …
… done

Saving mail and FTP users …
… done

Backing up mail and FTP user Cron jobs …
… none to backup

Copying Apache virtual host configuration …
… done

Copying Apache log files …
… done

Copying Webalizer configuration files …
… done

Copying SSL Apache virtual host configuration and certificate …
… done

Copying Logrotate configuration …
… done

Dumping MySQL database wine …
… done

Backing up Webmin ACL files …
… done

Backing up AWstats configuration file …
… done

Creating TAR file of home directory …
… backup of dir failed :

Backup failed! See the progress output above for the reason why.