Their webpage suggests replacing Dropbox with a self-hosted cloud service. I am not confident enough to put all my personal documents on a home NAS server which runs 24/7. It's basically open for hackers in the whole world to scan and eventually put ransomware in it.

I feel I am more comfortable with saving my documents on respected cloud service.

I do have a NAS at home but its not open to the internet and I don't put my documents on it, just media files.