You'll need to DTRACE the StorageFileWatch process.
The online help explains a little bit about the settings, particularly:
. Enter the amount of time that must elapse since items were archived before they are eligible for collection.
Note the following:
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Enterprise Vault does not collect files until they have been backed up. Do not set the elapsed time to less than your backup frequency, otherwise Enterprise Vault wastes resources repeatedly checking whether the files have been backed up.
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To aid indexing performance, Enterprise Vault should index items before they are collected. You should therefore allow a minimum of one day before items are collected.
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A long delay provides no benefit, except that until collection occurs the items are retrieved more quickly.