Using time machine to backup my mac to external harddrive as well as backing up a second seperate harddrive to another external hard drive???

Hey Guys, i currently have time machine backing up everything on my 2011 imac to an external harddrive, which is working fine! No problems there.
As a photographer, i currently have two seperate harddrives. Harddrive (A) - All projects/files, & Harddrive (B) - Backup of Harddrive (A) with all projects/files.
What i'm wanting is for time machine to continue backing up my i mac as usual to the external harddrive, whilst also backing up the contents of Harddrive (A) to Harddrive (B) at the same time without backing up everything on my imac
Is this possible to do??
Hope you understood what i meant easily! haha
Cheers
Leslie

Sorry Leslie but time machine cant do what you are asking for, however there are free apps like backuplist+ that can sync Harddrive to Harddrive, the app can be found here 

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