Nothing compares with a Storage server from HetsnerOVH or other dedicated servers where you can have 24 or 48 TB or more for backups (regarding price)
Yes, hardware might fail once every 10 years, but I guess it is just backup, not production, so you bring another backup server up, and you start backing up again.
The chance for production and backup to fail at the same time are probably so small that you can call it 0. The fact that Enhance offers a solution that is cost-free, included in the package and solution tested and maintained is superb.
Dedicated servers = your storage, your traffic and no limits on how much data you restore, not sure what anyone can ask for more! 🙂
I am not sure why you would need to save backups somewhere else, unless: it is cheaper (and there is nothing cheaper than a dedicated storage server unless it is oversold)