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 a 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/YYYY 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.