Initial backup time

I am a new prospective user of Acronis. The online backup looks great, but I was a little concerned about the amount of time required to execute a complete backup, as estimated in the FAQ.
The comment there was to the effect. "most users find they can back up 2 to 5 GBytes per day."
I have a lot of photos, docs, and music on my systems (several Windows PCs), and an accumulation of nearly 180 GB. Can it be true that I might expect to take up to 90 DAYS to upload that first backup?!?
SpeedTest.net shows my upload speed typically around 5 mbps. From that, I calculate about 4 days.
Is there some other limit, perhaps in Acronis' system, that could slow that down so drastically, or is my high speed connection simply that much faster than the norm?

Thanks for any experiences and suggestions!

Dave