While I trust JRiver not to take advantage, I'd rather see JRiver put the time and resources somewhere else.
I have a robust backup system at home. That includes a backup of the MC backups.
If I want to backup the MC library to the Cloud, I can easily just copy a backup to OneDrive, encrypted or not. I could also automate that if I wished.
The capability may be of interest to non-technical users. But would they even remember that such a backup existed, and if so, how to access it? There are many threads where the restore of a backup would solve a user's problem, but they don't even recognise the solution or existing capability.