If you’re trying to remotely configure Windows Server Backup on another machine (maybe because it’s running Server Core), you may find that the MMC snap-in for Windows Server Backup crashes when trying to use the “Connect To Another Server…” option. In this case, an error may occur stating the MMC has detected an error in a snap-in and will unload it.
I have found that this may occur when only the Windows Server Backup console is installed, but not the Windows Server Backup feature itself (which the snap-in appears to rely on).
In order to resolve this, simply install the Windows Server Backup feature on the machine that you wish to run the Windows Server Backup console from.