If you try to set up a backup from within the ADMS Console, in some environments you can get this message.
Trying to set up an incremental backup you will get the "Failed to create incremental backup task"
This happens because the command being sent to the Windows Task Scheduler is using a MM/DD/YYY format.
You can use one of the following workarounds
1) Manually create the task in Windows Task Scheduler
2) run the following script modifying the variables appropriately
schtasks.exe /Create /SC WEEKLY /D SUN /TN "Vault Full Backup" /TR "\"H:\lib\Debug\VaultFullBackup.bat\"" /ST 23:00:00 /SD 06/28/2012
3) Change the locale of the Vault Server to one that uses a MM/DD/YYYY format (e.g. English US)
Autodesk will be addressing this issue in a future release.