troubleshooting Question

Need Some Help Setting Up Exchange 2016 in a Hybrid Configuration

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csimmons1324Flag for United States of America asked on
ExchangeMicrosoft 365
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Some time ago, I worked with CDW to move to Office 365 / Hosted Exchange Server from our on-prem Exchange 2013 server.  They had me use Skykick to migrate my mailboxes to the cloud.  I don't recall working with them to configure our on-prem Exchange 2013 server in a hybrid configuration.  

The on-prem Exchange Server remained online and part of our domain; partly because I was not told by Skykick to decommission it after the migration and partly because I got side-tracked with other projects.  

Some time later, I learned that I needed to keep an on-prem Exchange server to take advantage of mail-enabled security groups and other features that were not yet available in a hosted Exchange environment.  This was the first time that I learned about a hybrid environment and that Microsoft provided you with a free copy of Exchange to run when using a hybrid configuration.  

Fast forward to today, I am deploying a new VM running Server 2016 and Exchange 2016 to replace our old Exchange 2013 server.  I was able to get Exchange 2016 installed and also installed Azure AD Connect.  It seems that everything synced as my user mailboxes now show up in Exchange 2016.  

I am now running the Office 365 Hybrid Configuration tool.  I am at the point where the wizard is asking me if I want a "Minimal Hybrid Configuration" or a "Full Hybrid Configuration."  I am not sure which option to select.  What do you suggest?

I am pretty confident that all of our Exchange data currently exists in the cloud as we have been using the hosted Exchange Server for a number of years.  As I set up this Exchange 2016 server in a hybrid configuration, is there any risk of some form of "syncing" taking place that would wipe out all of the data in a user's mailbox that is on the hosted Exchange server?

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