We want to use incremental backup tool for mongodb.
In our usecase, we have to backup local data to cloud storage (such as aws or gcp), so cost reduction of data transmission is important issue.

Here is my implementation of incremental backup with oplog.
In this implementaion we dump oplog regularly in oplog.bson and add the postscript to oplog.bson file.

What do you think about our usecase and incremental backup?