Why doesn't BCDEDIT /export filename work in Windows 10?

I found several web pages that list this command as a way to back up the BCD Store. But when I tried to run this command on 2 different Win 10 Pro 64 systems, I got an this error message:

C:\Windows\system32>bcdedit /export D:\Systems\BCD Backup
The store export command is invalid.
Run "bcdedit /?" for command line assistance.
The parameter is incorrect.

Bree said:

Because there's a space in the name 'BCD Backup' you need quotes around the string (or just use a name without a space).

This fails...

C:\WINDOWS\system32>bcdedit /export c:\temp\BCD Backup
The store export command is invalid.
Run "bcdedit /?" for command line assistance.
The parameter is incorrect.

...but this works.

C:\WINDOWS\system32>bcdedit /export "c:\temp\BCD Backup"
The operation completed successfully.

So what did I do wrong this time?

C:\Windows\System32>bcdedit /export "c:\temp\BCD Backup"
The store export operation has failed.
Cannot create a file when that file already exists.

I just created this BCD Backup now inside my c:\temp folder.

Bree said:

Took a while to experiment and reproduce that error. I think you may have first created a folder in C\Temp called 'BCD Backup' then tried to run the command bcdedit /export "c:\temp\BCD Backup" expecting it to put the backup in your folder.

It doesn't work that way, the command creates a file called 'BCD Backup' in C:\Temp. In any given folder NTFS does not allow you to have a file and a folder that have the same name. Delete your BCD Backup folder from C:\temp and try the command again.

I can't believe I so misunderstood the help file. I finally got this to work.