Which Is More Secure: On-Prem or Cloud Data?The short answer is this: Data, regardless of storage location or medium, is as secure as you make it.

The use of cloud-based data processing and storage has grown significantly in the past decade, a trend that is expected to continue. A recent IDG Enterprise survey reported that 70% of organizations surveyed had moved at least part of their data or infrastructure to the cloud, with another 16% planning to do so within the next year. Cloud data storage is no longer something that “other companies” do. The value in both cost savings and time-to-market means that most organizations can realize a benefit from moving at least some data and applications to the cloud.

When comparing cloud to on-prem, each has a number of benefits and shortcomings. On-prem data storage is inherently more flexible, because you can configure your environment exactly how you want it. Cloud data storage reduces up-front costs by eliminating some hardware purchases and data center build-out costs, and can often be configured in hours as opposed to weeks or months for on-premises storage. There is no one-size-fits-all solution; some apps will be a better fit for the cloud, while others work better with on-prem storage and processing.

Which Is More Secure: On-Prem or Cloud Data?

Of the reasons given to resist cloud data storage, by far the one I’ve heard the most is a concern over security. The traditional approach for applications and data storage has been to keep those things within the walls of the organization, especially when the nature of the data is especially sensitive (such as HIPAA or other PII data). I can’t count the number of times I’ve heard someone say that they’d never migrate a particular workload to the cloud because it isn’t secure enough.

I really do sympathize with the emotion of such a statement. Moving sensitive data from a location over which you have physical control (a data center) to one that you don’t (cloud storage) feels like you’re surrendering control of that data. For those unaccustomed to trusting an outside vendor to host their data, this can be an uncomfortable feeling.

However, to look at this in context, think about all of the ways your data is currently being used even when stored on-prem. The odds are high that one or more of these statements is true:

  • Some internal “super users” have carte blanche access to data
  • Some systems allow for generic password-based logins (such as using SQL logins rather than Windows authentication), permitting largely unaudited data access
  • Access to the database itself is controlled and audited, but the backups do not have the same level of security
  • Those responsible for monitoring your firewalls and other barriers also wear a lot of other hats, and/or do not provide 24x7x365 coverage for security monitoring
  • Backups of data are physically transported offsite
  • Service accounts that run core database services (such as SQL Server Agent) have broad permissions for data access for convenience
  • Some data extracts shared with outside vendors, who may also be permitted to share it with their vendors as needed
  • Some vendors even have direct access to your systems
  • Data from third parties is imported into your systems on a scheduled basis using automated tools
  • Nontechnical vendor staff (such as janitorial or building maintenance personnel) have physical access to locations where data is stored
  • Password length and/or complexity is not systemically enforced

This is a very small subset of an innumerable list of activities that require a good deal of trust in people, both internal and external. Data loss and data breaches are only as secure as the weakest link in the virtual chain, and it is far more likely to have a failure of either human error or system design than to have such an event occur simply because you chose a cloud platform versus storing data in-house. A bad guy will have a much easier time crafting a social engineering breach or dictionary attack than hacking the platform itself, whether on-prem or cloud.

Security Depends on You

This doesn’t mean you shouldn’t ask tough questions regarding security when selecting a cloud vendor. When evaluating those services, ask about topics like colocation, multitenancy, penetration testing and monitoring, and physical security. Ask how and when their vendors and partners would have access to your data. Apply at least as much scrutiny in this decision as you apply to other vendors who will have access to your data. But don’t assume that the data is not secure just because you don’t have physical control to the data center or media.

When choosing the cloud for application or data storage, you’re simply trusting a different team to handle what your in-house staff would manage for on-prem storage. In many cases, the cloud vendor will have deeper expertise, better proactive monitoring, and round-the-clock coverage that an in-house team may not be able to provide.

As a business owner, I trust my application and data storage needs to cloud solutions. Tyleris Data Solutions does not own any physical servers, instead relying on trustworthy cloud vendors to store our mission-critical data. There will be some workloads that I would want to handle in-house in a local colocation, but with respect to security, my vendors are far better equipped to manage round-the-clock security than my team is.

The fact that you can walk into your data center and physically touch the server hosting your on-prem data does not make that data more secure. Proximity does not imply security. Data and applications are only as secure as you make them, whether hosted in-house or in the cloud.

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