CobianSoft

Hello,
cobian 2.1 does not make differential copies, it makes full copies every time, but in the options I checked the right options?

Too little information...

what information would you like?

Everything about the task.

ok, here they are

Next

OK, so its making separated differential backups.

But you want to keep only 2 differentials and make 1 full every 20 differentials. But how do you get to 20 differentials if you only will have 2 differentials max?

Thank you for your clarification
I didn't know that this could cause problems.
Can you advise me how to do this?
This is my situation:
a) I have a lot of files that take a lot of time to save. That's why I make a full copy after 20 days. Maybe I should remove this option.
b) my backup hard drive does not allow more than 4 full backups

Perhaps somebody else can help you with this question.