I think you're going to be running into some considerations trying to do what you're describing. and you may lose some of your most recent data as you restore the last incremental backups.
It sounds like you've got the data source restored from the H2 backup, and are on to restoring the data. I would extract the incremental NoSQL backups atop one another, starting with the chronologically first using a new directory. Next, I would get the list of Data Point IDs from the database or the SQL commands you used to create them. Inside the mangoTSDB that you have unzipped, you should see many folders 0-99. Inside these directories, you will find more numbered directories. In this second tier of directories, the name of the folder is the Data Point ID.
So, mangoTSDB/49/1/ contains the data files for Data Point ID 1. You can copy the point's folder from the restored database into the active database for each point you need to restore. Be sure to put it in the same top level 0-99 directory!
In a simple restore you will lose the data in the time between your last incremental backup and the current moment, in most cases.
To find a particular folder, you can do something like:
find mangoTSDB/* -type 'd' -name '123'
for a data point with ID '123'