Cacti + Bandwidth

[Simo7778]

Hi,
I have a question and I need a little help to understand it.
I have a server hosted in one of the companies which use as monitoring system for bandwidth cacti. I run a backup daily to another remote server (home)
Since I increased my ISP bandwidth from 5 to 25 Mbps, My hosting company send me a cacti graph showing a big peeks on my bandwidth consumption and went over my the bandwidth contract that I have with the hosting company?

I want to know how the increased ISP home bandwidth has increased my hosting bandwidth consumption

Thank you

[Linegod]

This is a question for your ISP, not for us.