This setting controls which date field should be considered when selecting records from HP Records Manager / TRIM for TRIMPush collections. There are three possible values:
Record registration date
Attachment creation date (Creation date of the actual binary file attached to the record)
Record last updated date
updated will always be updated regardless of the action performed, however it will also be updated when the HP Records Manager / TRIM gatherer will extracts a record if auditing is enabled in HP Records Manager / TRIM. If this happens, all the records will be re-gathered again and again as their updated date will always be updated by the crawl itself. For this reason the use of this date field is not recommended.