AOMEI Backupper Software Questions
	
	
		Hello,
I have been using AOMEI Backupper free edition. I have  been doing weekly differental disk backups.  I have done one system back  up as well.  I backed up to an external hard drive.
If doing a  new system backup using that software should I do a full system backup  or would a differental system backup do the same? The software offers  incremental and differental backups for system. I am trying to  understand why those are offered for system backups.  I thought system  backups should always be full backups. How often would you suggest doing  full system backups?
Also would you use Backerupper to backup  folders/files or would you sync them or copy them to external hard drive  by copy/paste or drag and drop?  I know the choice is mine just trying  to get others opinions.
I want to make system restoring as simple as possible should the need ever arise.
I only want to use free software.  
Thanks for your help.