Considering that this script was posted in 2008 and the last reply is from 2011, can I ask if this script is still working or if you/KH support team could post an updated script? I am sure many of us would appreciate it!
I don't have a BQbackup account any longer but it was a fairly rudimentary script so I don't see why it wouldn't work. I thought I saw you were using Amazon S3 for your backups though.