What’s a simple backup procedure for an ESS 5.x system?

What is the meaning of each file string in dxxxxxxxx where xxxxxxxx is a hexadecimal code in the InfoNode Data folder? Are files the ones storing the measurements?

What is the “infonode.db” file used for? Do I need to backup it up?

What if I delete accidentally some of these files?

Is each file matching to one DataNode?

What if we set the size of the database to 20 GB; would be the stability of the database deteriorate in this case?

If I deleted information of the DataNodes through ESS Setup/Store, does the size of the files decrease?. I remember this did not happen with the earlier database.