CrowdStorage too slow backup

So I have tried to use the CrowdStorage bakcup application that now is available on My Cloud Home (4tb)

I have it connected to my Google Nest Wifi at home. It has a Gigabit ethernet port, and I have fiber internett with speeds of 500 / 500 Mbit.

When I try to use the CrowdStorage backup, it only hovers around 6-8 Mbps.
The problem is that the bakcup never finished, because of the slow upload is has som dataloss during the 7-14 days it would take to backup my currently 1.6 TB disk.

Suggestions? and does any other backup services work?
I am in dialog with the support of CrowdStorage (very helpfull) but they have no idea why it is so slow.