export_sync scrubbing
export_sync records are date-based records used by the recoverpacket command to reset a replica’s epoch number matrix. If you do not use this packet recovery method (because you use chepoch –actual or lsepoch/chepoch), you can scrub these records aggressively. If you use the recoverpacket command, you must keep export_sync records for the number of days that elapse between backups.
By default, the vob_scrubber_params file has no entry for export_sync records, and these records are scrubbed with the same frequency as oplog entries. If you want to scrub export_sync records at a different frequency than oplog entries, you can set the export_sync parameter in the vob_scrubber_params file. For more information, see the vob_scrubber reference page.