Susan:

Thanks for confirming that this problem is still occurring. I've known about it for some time but have been waiting for the resent upgrade to see if it would go away (there has been so many problems with DataCare the last 12 months that we stopped reporting and investigating them).

I can confirm that it only happens at large sites. The Z01 is the temp file and if it still exists then the process of creating the ZIP file was interupted. The problem is what is interupting this backup as it is very random.