I'm trying to move our MySites out of the WSS_Content DB, and ultimately to
a new server. My thought was to move the MySites on the current server to a
new content DB, and then move that content DB to the new server.

When I run the MoveSPSite command (PS C:\Users\mossadmin> Move-SPSite
http://wbhoprexmb01/my -DestinationDatabase WSS_Content_MySites_Temp), I get
the following error

Move-SPSite : The content database could not be found.
At line:1 char:12
+ Move-SPSite <<<< http://wbhoprexmb01/my -DestinationDatabase
WSS_Content_MyS
ites_Temp
+ CategoryInfo : InvalidData:
(Microsoft.Share...PCmdletMoveSite:
SPCmdletMoveSite) [Move-SPSite], SPCmdletException
+ FullyQualifiedErrorId :
Microsoft.SharePoint.PowerShell.SPCmdletMoveSite

I have double checked that the database exists, and that the user has rights
to the database.

Is this the proper approach, or should I take a different route?