SQL Server 2012 - Log Shipping from a database that is part of an availability group by Neil Matthewson

When log shipping a database that is part of an availability group, although all jobs succeed a trn file is not produced. Therefore it is not copied, nor is it restored.

An example of it not being produced;


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Microsoft (R) SQL Server Log Shipping Agent
[Assembly Version = 11.0.0.0, File Version = 11.0.2100.60 ((SQL11_RTM).120210-1917 )]
Copyright (c) 2012 Microsoft. All rights reserved.
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2012-11-17 12:44:42.93 ----- START OF TRANSACTION LOG BACKUP -----
2012-11-17 12:44:43.00 Starting transaction log backup. Primary ID: '0a6c7977-a1e3-4967-b4c6-ee88482ab1c4'
2012-11-17 12:44:43.01 Retrieving backup settings. Primary ID: '0a6c7977-a1e3-4967-b4c6-ee88482ab1c4'
2012-11-17 12:44:43.03 Retrieved backup settings. Primary Database: 'ABC', Backup Directory: '\\ABCDB04\pendingv$\ABC', Backup Retention Period: 240 minute(s), Backup Compression: Server Default
2012-11-17 12:44:43.15 Deleting old log backup files. Primary Database: 'ABC'
2012-11-17 12:44:43.16 The backup operation was successful. Primary Database: 'ABC', Log Backup File: ''
2012-11-17 12:44:43.17 ----- END OF TRANSACTION LOG BACKUP -----
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Exit Status: 0 (Success)
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The workaround is to select 'Primary' under backup preferences.


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2012-11-17 12:46:07.00         ----- START OF TRANSACTION LOG BACKUP -----
2012-11-17 12:46:07.05         Starting transaction log backup. Primary ID: '0a6c7977-a1e3-4967-b4c6-ee88482ab1c4'
2012-11-17 12:46:07.05         Retrieving backup settings. Primary ID: '0a6c7977-a1e3-4967-b4c6-ee88482ab1c4'
2012-11-17 12:46:07.07         Retrieved backup settings. Primary Database: 'ABC', Backup Directory: '\\ABCDB04\pendingv$\ABC', Backup Retention Period: 240 minute(s), Backup Compression: Server Default
2012-11-17 12:46:07.15         Backing up transaction log. Primary Database: 'ABC', Log Backup File: '\\ABCDB04\pendingv$\ABC\ABC_20121117104607.trn'
2012-11-17 12:46:07.28         Deleting old log backup files. Primary Database: 'ABC'
2012-11-17 12:46:07.31         The backup operation was successful. Primary Database: 'ABC', Log Backup File: '\\ABCDB04\pendingv$\ABC\ABC_20121117104607.trn'
2012-11-17 12:46:07.33         ----- END OF TRANSACTION LOG BACKUP -----
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Exit Status: 0 (Success)
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This is ambiguous since these backup preferences are being sold as full backup options imo, and yet with this selected I can still go and perform a backup on a secondary server.