#233 backup changes before backup

[no4018]

I want to do the following every night (automatically):
1: Compaire 2 directories (A=working directory and B=yesterdayst backup) and copy all differenses (deleted changed, etc.) to a dated location (f.ex. changes-"date").
2: Then copy A to overwrite B. (If somethings happen to my disk(picture collection) I just want to copy B to new A, if unwanted changes has happend to single files I want to find that file only - far, far back in time)
Can this be done using Areca backup (standard, script, etc...)?