Cloud backup takes too long

Hi,

I have a licence for 3 computers. I do a backup on the Cloud once a week. Since it is incremental, it should not take too long. I don't do much changes on the computers in a week. But it takes at least 6 hours each time!

Is there a way to accelerate that? Also, in the advanced tab the priority is at High. What else can I do?

My ISP doesn't do throttling and my speed is 30/10 MB.

Any ideas? Thanks.