Simple Backup question

[Jason]

Hi,

I'm using Simple Backup to backup my files. It will create a full
backup first then only backup files that have been changed.

My question is that how to restore the files? For example, I have a
full backup on Jan 1. I changed file A and B on Jan 2 and 3, so there
are incremental backup on Jan 2 and 3, containing A-new and B-new. If
I restore from Jan 3's incremental backup in Simple Backup Restore, I
 will get A-new or A? 

Thanks!

-- 
Jason