Event ID: 3041 - BACKUP failed to complete the command BACKUP LOG Managed Metadata Service

We were seeing the following on our Windows 2016 server running sQL 2014:

Log Name:      Application
Source:        MSSQLSERVER
Date:          25/10/2019 00:19:28
Event ID:      3041
Task Category: Backup
Level:         Error
Keywords:      Classic
User:          NT SERVICE\MSSQLSERVER
Computer:      server.domain.local
Description:
BACKUP failed to complete the command BACKUP LOG Managed Metadata Service_51cd38bf72394105be73a0d7d1d6e24e. Check the backup application log for detailed messages.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="MSSQLSERVER" />
    <EventID Qualifiers="49152">3041</EventID>
    <Level>2</Level>
    <Task>6</Task>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2019-10-24T23:19:28.014493800Z" />
    <EventRecordID>145120</EventRecordID>
    <Channel>Application</Channel>
    <Computer>server.domain.local</Computer>
    <Security UserID="S-1-5-80-3880718306-3832830129-1677859214-2598158968-1052248003" />
  </System>
  <EventData>
    <Data>BACKUP LOG Managed Metadata Service_51cd38bf72394105be73a0d7d1d6e24e</Data>
    <Binary>E10B0000100000000C000000540043004800410049004B004F00560053004B005900000000000000</Binary>
  </EventData>
</Event>

It turned out that there was an old server share entry in our maintenance plan that needed to be removed...