Drobo 5N2 User Manual page 50

Note:
The name must be 1 to 27 characters in length and should not contain reserved characters
or spaces.
7. Select the Enable Time Machine Support on this share checkbox and enter the backup size
(GB) and click OK.
8. The backup you just created gets listed in share settings page under the Select a Share section.
Drobo5N2 User Guide 50