Recuva urgent help needed

Hi
I am trying to recover HUGE amount, about 2TB, of data.
I was on the rash when I started Recuva and did not check options. So, now when 14 hours scan is complete, I checked options and under Actions --> Recovering I checked RESTORE FOLDER STRUCTURE, right below that is SECURE OVERWRITING option, what does it mean, what part will be erased?

Or should I just rescan my HDD with all options checked first?

Please help.

Appreciate in advance

Edit. I don't want to overwrite anything. Once recover is complete, I will just reformat drive and that is it. So, how to avoid that or iti is automatic?
 


Thanks
I do understand what it means Restore folders and Overwrite.
But I don't want to overwrite, so I can use other tools to double check drive again as Recuva scan shows 60 ignored files and about 25 unrecoverable files. Can I refuse secure overwrite somehow?

And, OPTIONS, do I have to select options prior to scan (I don't remember seen them) or I can select options after the scan is complete?

Appreciate your advises.