On the Production Server I created the Job ‘DBA – Backup/Restore MyDatabase’ with two steps 1) Backup MyDatabase, and 2) Restore MyDatabase.

Step 2 just started the Restore job on the Reporting server (detailed in “Part 3”)

Step 1 needed to check that no random backups had happened in the last 24 hours before starting a Diff Backup …

-- If its Friday or the LSN's do not match - do a FULL backup

	DECLARE @DBName VARCHAR(100) = 'MyDatabase' --<< Database Name
	IF (SELECT DATEPART(dw, GETDATE())) = 6	--<< = Friday
	OR (SELECT MAX(differential_base_lsn)
	    FROM [MyProdServer].[master].[sys].[master_files]
	    WHERE [name] LIKE '%' + @DBName + '%')
	    !=
	   (SELECT MAX(differential_base_lsn)
	    FROM [MyReportServer].[master].[sys].[master_files]
	    WHERE [name] LIKE '%' + @DBName + '%')

	BEGIN
		SELECT 'We can only do a FULL backup'
		EXECUTE [master].[dbo].[DatabaseBackup] 
			@Databases = @DBName,
			@Directory = N'\\MyReportServer\backups', 
			@BackupType = 'FULL', 
			@CleanupTime = 1, --<< ONE HOUR
			@CleanupMode = 'BEFORE_BACKUP',
			@Compress = 'Y',
			@CheckSum = 'Y',
			@LogToTable = 'Y'
	END

-- Else do a DIFF backup

	ELSE
	BEGIN
		SELECT 'we can do a diff backup' 
		EXECUTE [master].[dbo].[DatabaseBackup] 
			@Databases = @DBName,
			@Directory = N'\\MyReportServer\backups', 
			@BackupType = 'DIFF',
			@CleanupTime = 168, --<< ONE WEEK
			@CleanupMode = 'BEFORE_BACKUP',
			@Compress = 'Y',
			@CheckSum = 'Y',
			@LogToTable = 'Y'
	END

https://richardbriansmith.wordpress.com/2015/10/02/diff-backup-restore-part-3/

https://richardbriansmith.wordpress.com/2015/10/02/diff-backup-restore-part-1/

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