There is a registry key that can change the default File Watch process (which initiates once every 12 hours or when the Storage Service is restarted) - you can reduce this.
The registry key is FileWatchScanInterval.
Location HKEY_LOCAL_MACHINE
\SOFTWARE
\KVS
\Enterprise Vault
\Storage
Content DWORD value with a value set to a number minutes.
If the value is set to 0 then no rescanning is performed. If the value does not exist then the rescan is done every 12 hours.
Each Enterprise Vault Storage Service has a component called StorageFileWatch. This is a process that runs when an Enterprise Vault Storage Service is started and scans the Vault Store NTFS files to check whether they have been backed up.This value enables you to set how frequently these scans happen.