TFS Daily scheduled Back-up is Failing - database

Question

We have TFS2015.3. And we have scheduled DB backup in TFS using TFS admin console. But we are finding that TFS DB back up failing frequently with below error:
Exception Message: Write on "\XASDC\public\DASC\IT\BACKUPSQL\XXXXX1234\TFS\Tfs_CollectionA_9859957732898727191F.bak" failed: 1359(An internal error occurred.)
BACKUP DATABASE is terminating abnormally. (type SqlException)
SQL Exception Class: 16
SQL Exception Number: 3202
SQL Exception Procedure:
SQL Exception Line Number: 1
SQL Exception Server: XXXXX1234
SQL Exception State: 1
SQL Error(s):
SQL Error[1]: System.Data.SqlClient.SqlError: BACKUP DATABASE is terminating abnormally.
Class: 16
Number: 3013
Server: XXXXX1234
Source: .Net SqlClient Data Provider
State: 1
Procedure:
Line Number: 1
Exception Data Dictionary:
HelpLink.ProdName = Microsoft SQL Server
HelpLink.EvtSrc = MSSQLServer
HelpLink.EvtID = 3202
HelpLink.BaseHelpUrl = http://go.microsoft.com/fwlink
HelpLink.LinkId = 20476
Exception Stack Trace: at Microsoft.VisualStudio.Services.Configuration.SqlDatabaseBackupRestoreComponent.Execute(String sqlStatement)at Microsoft.VisualStudio.Services.Configuration.SqlDatabaseBackup.Backup(ISqlConnectionInfo connectionInfo)
at Microsoft.TeamFoundation.Admin.Jobs.DatabaseBackupJob.TakeFullBackupOfSingleDatabase(IVssRequestContext requestContext, String dataSource, String databaseName, String fullFileName, ITFLogger logger)
at Microsoft.TeamFoundation.Admin.Jobs.DatabaseBackupJob.TakeFullBackups(IVssRequestContext requestContext, BackupSettings settings, List`1 databaseConnectionInfoList, ITFLogger logger)
It is failing only for a particular Collection. We have 11 collections and Back-up is fine for 10 Collections. But for this particular collection, the scheduled Back-up failed. On rerunning the Backup job manually it succeeds. It failed twice in last 4 days.
Kindly requesting your help to get the issue resolved.

Answer 1

Seems it could be a connection issue with high workload, or an issue like "data cannot be read".
Just try below items to narrow down the issue :
Detach the specific collection from TFS admin console, then re-attach
it.
Change the backup location to local machine instead of UNC path (There is a possibility that caused by the network.).
Recreate the BackupSets file:
Go to the directory where your back ups are stored
Find something like "BackupSets.xml"
Rename it to "BackupSets_BACKUP.xml" (or anything else of your liking)
Schedule the backup in TFS Administration Console