Can we do incremental sync of MongoDB based on a schedule?

Can we sync a mongodb database to another incrementally based on a schedule? Say, once every night at 12 am? **Background:** We have a MongoDB replica cluster consisting of 3 instances, all located within one data center. For backup, the company is acquiring another server in a different country. This rises two questions for us. 1. Does MongoDb allow us to do schedule syncing. 2. Can the syncing be incremental by not replacing data that is already synced. We initially thought of adding the new server to the replica set as a passive replica. However, we got input that it will slow down the cluster as the new server will have high latency.