SQL Server Backup failure

The fault information is as follows:

title: Microsoft SQL Server Management Studio
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Backup failed for server "*******". (Microsoft.SqlServer.SmoExtended)
for help information, click: Http://go.microsoft.com/fwlink? prodname=microsoft+sql+server&prodver=10.50.4000.0+ ((kj_pcu_main). 120628-0827+) &EvtSrc= microsoft.sqlserver.management.smo.exceptiontemplates.failedoperationexceptiontext&evtid= Backup +server& linkid=20476
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Additional information:
System.Data.SqlClient.SqlError: Media loaded on "C:\data\*****201604271307.bak" has been formatted to support 1 media families, but 2 media families should be supported according to the specified backup device . (MICROSOFT.SQLSERVER.SMO)
for help information, click: Http://go.microsoft.com/fwlink? prodname=microsoft+sql+server&prodver=10.50.4000.0+ ((kj_pcu_main). 120628-0827+) &LinkId=20476
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button:
Determine
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Fault:

Solution:

The main cause of this error is that there are two backup files in the red box, and one can be deleted. In fact, Microsoft's error has been explained very clearly, but the translation is not good enough.

SQL Server Backup failure