Empty FileDB folder

Hi,

I have been testing a migration of an appset from dev to live and have been following the document, "SAP_BPC_70SP00M_ServMgrGde.pdf"

Its a multi server environment, migrating from and to v7

The restore is failing at step three because the FileDB folder created when backing up the appset contains an empty zip file.

Would be grateful if some could tell me what should be in this zip file and why it would be created empty by the backup, which did not report any errors. The content of the other 2 folders is quite straight forward, bak file and application folders/files.

The above guide only mentions "FileDB - Contains a zip file that contains the files in the backed up FileDB folder"

Many thanks