My backups fail also. I'm told its fixed in SP2. So, 3CX, you are saying go ahead and update to fix the problem, which by the way ..
"Warning - this is a BETA Update. Some functionality might not be fully tested and can have bugs. BETA updates are not to be used in production environments. BETA Updates can not be reverted. However from a BETA Update, you can update this to the next beta or to the Release."
Well I am in a production environment and I can't back up and you are telling me to install a beta version that can't be reverted.
I expect better than this.