Promethius began migrating on-prem Microsoft Exchange Servers to the cloud about fifteen years ago and we haven’t looked back. Initially, multi-tenant, cloud-hosted Exchange Servers were owned by third-parties, like Intermedia and AppRiver. This arrangement worked very well until Microsoft decided to get serious about the hosting game in 2011 with Office 365 (I’m purposely ignoring their BPOS service that launched in 2008 because I still have nightmares about it). Microsoft seriously undercut the pricing of its own partners and put most of them out of business. The positive of this move, however, is that Office 365, and now Microsoft 365, have become very solid and essential business services boasting almost 2.4 million business customers. Of course, Microsoft 365 isn’t just email hosting, it’s hosted documents via SharePoint and OneDrive and it’s a project management via Planner and the list goes on and on.
In our 10 years of experience with Microsoft 365, we’ve had very few issues of lost emails/documents, but it should be recognized that Microsoft 365 doesn’t offer a traditional backup and recovery system with lots of retention options, etc. As far as disaster recovery of Microsoft servers go, they seem to rely on their extensive redundancy. This is probably adequate, but companies sometimes get caught off guard when it comes to the email and document retention policies. Deleted emails have a maximum recovery period of 31 days and SharePoint/OneDrive documents have a maximum recovery period of 93 days. Keep in mind also, that this isn’t the industry standard off-site backup. These emails and documents are saved to the same network that is hosting the live data. Many small companies choose not to pay for third-party backup even when these facts are pointed out, but a third-party backup of your most crucial communications and company documents is probably worth a discussion. You might be surprised to learn how affordable it is.