The overview instructions for the data cleanup tips mentions "the main DBA folder"    and tip#7 mentions "the root DBA folder"    
I thought the main folder was the one that i backup everyday that has the same name as the company number.  I am not sure what the DBA root folder is?
And I am not sure how these two interact with the Default folder?    How can I understand the purpose of these three folders?

Folder 12 is my current company data and the files types are B12 File.   (this is the one i back up everyday)
Test Data Folder has file types B99 file
Default Folder has B file  (which for some reason also has lots of current year activity)  that i didn't know to backup.
 
The Default file (which I don't use) has 8 random files with 8 random dates from 2019  and lots of files from 12/22/2018 which is when I think Lynn did an upgrade for us.   And then it goes all the way back to 2012 which is when we moved to our new server.
 
The files we use everyday are B12 files and I think most folks use plain ole B files.  
 
Which of these is root and which is main?
 
Any insight is much appreciated.  
 
Thanks
Laura Oliver  
I do not think i should attempt #7 if I dont understand the purpose of the 3 folders,  root, main and default.    
Thanks
 

Thanks!
 
If i am not using company B.  (we use B12) why is there new  recent B files created  in the default folder?
 
Laura