I recently purchased an EX490 and installed 3TB of storage.  Setup went well.  All PC functions seem to be working quite well, including backups.

I have 3 Macs and began the process of setting up a Mac share to backup those machines using Time Machine.   I ran into some problems with one of the Macs, so I decided to start over.  I deleted the Mac share I had created so that I could recreate with the right user access settings.  Now, I can not create a new share with that same (once used) name of "Mac".  On the "adding the shared folder" window, I get the big red X next to the "Adding the shared folder" step.   I was able to create a share that I call "temp", delete it and recreate it with no problems, but not the Mac folder.   Also did create a Mac1 and tried to rename that share back to Mac, it also failed.   I get a message that says "The shared folder was not renamed because it is being used by one or more users.  Try to reuse the folder again when it is not being used."   It will let me rename any share to anything but "Mac" it seems.   (As I also tried renaming a "temp" share to Mac, same problem.)   So, the share name "Mac" seems to be locked since I had used it briefly for Apple Time Machine backups prior to deleting.

Any suggestions on how to clear this share name so I can set it again for Apple backups?  Or, is there some way to use a share name other than "Mac" for Time Machine backups if it turns out I can't clear this problem.

Thanks for the help!