I was trying to use Time Machine to back up my Mac to my Drobo 5N and got the following message.
[quote]Time Machine completed a verification of your backups on “Drobo 5N”. To improve reliability, Time Machine must create a new backup for you.
Click Start New Backup to create a new backup. This will remove your existing backup history. This could take several hours.
Click Back Up Later to be reminded tomorrow. Time Machine won’t perform backups during this time.[/quote]
I would like to not have to create a new backup.
My Drobo is running firmware version 3.2.2 [8.57.73889]. I have Drobo Dashboard 2.6.7  running on Mac OS X 10.10.3 [14D136].