The disadvantages of onsite backup:
It costs time, a huge amount of upfront cost and does not support high scalability. Its security is prone to risks such as data theft, fire, flood. It also has limited IT support.
The advantages of online backup:
It works based on set-and-forget due to its automatic backup process, scalability, secure data center and server, 24/7 support, and high accessibility. Besides, your IT cost will be more transparent and predictable.