Moving new data from the latest database to the older database

Hi!, I am trying to restore data from from my older database backup using restore function in mongoDB cloud backup as there is an issue with the current one. However restoring the data will not have the newer data stored in the current one. I can manually add the missing data to the old backup but it will take too long. Is there any solution that I can do to move the missing data from the current one to the older backup much faster?