Sync question

I have set up DevonThink Pro office to sync with a NAS on my network, set to sync upon opening the database. It appears to try to sync every document every time. Since my database is about 105 gb (as per database properties) the sync runs all day and never reaches conclusion by the time I log off the computer at night. Is there a way to configure the sync to only sync newly created or modified documents, rather than the entire database each time?