On-premises is a solution that gives the customer the possibility to have an infrastructure with software and hardware deployed and running within the confines of his organization.
If you are seeking complete control over the infrastructural setup and you want your Data to stay in your
private network, an on-premises solution is what you need. Nobody other than your team will have
access to the information.

For this kind of choice, it is highly recommended to keep an updated
environment backup into a separate location in case of fire and/or data damage in the main location. Companies choose to keep their services running on an on-premises infrastructure as opposed to clouds primarily due to security reasons.
Another factor to choose an On-Premises solution is the customization: there are scenarios when a particular business needs a unique solution
tailored to its needs which a cloud-based software as a service may not offer.