QBackup folder question

Hi Forum

I have 9 QBackup folders in my Directory and 1 Quarantined item in Quarantine Security History - Fully Removed - Resolved No Action.  

 What is the difference between "Clear Entries" and "Remove From History".   Help offers info for ~

Remove From History. This action removes the selected Quarantine item from the Security History log.  & Mouse hover over "Clear Entries" offers Clear all items from this view. 

For 8 of the 9 QBackup folders...I do not recall if I opted on "Clear Entries" or/and "Remove From History"

Before I opt on 1 Quarantined item in History.  I would like to understand difference between Clear Entries and Remove From History & if any option from UI will delete QBackup folders.  Also, What data is contained in QBackup folders.  Are all QBackup folders retained until manually deleted.  Should I retain / delete QBackup folders.   Also, does rt.click scan of QBackup folders really scan contents of (encrypted) QBackup folders or is No Infection Found the default for unscannable folders.  

Thank you

bjm_