Even businesses with dedicated on-site IT staff have seen the wisdom of moving their email service. The advantages include per-person cost averages, cutting-edge security, cheap email storage, and simple ease of connectivity and deployment. While these advantages hold true for most organizations, there are not only exceptions but also hidden "gotchas" you should look for before selecting a cloud-hosted email provider.
Backups, updates, other management on autopilot. You want the host to offer some maintenance and handle things like backups, updates and etc. There’s high chance that the client won’t bother to take care of those things on their own. And since you always want to be protected in case disaster strikes, having those things taken care of on the host’s end can be incredibly beneficial.
If privacy is your number one concern, perhaps you should go with Protonmail. You can upgrade to an email with your domain easily on a web interface under “Protonmail Plus” or “Protonmail Visionary” plans. However, the plans can be rather expensive, as getting only 20 GB storage space could cost you at least €24/user/month/yearly. Most email hosting providers retain your emails for months even after you delete your account. This Swiss email provider will destroy all your data when you delete your account.