• Open Veeam Backup and Replication
• In the Home Tab, under Backups select Disk
• Right click the Backup you want to check and select properties

• In the popup window that opens, select the VM name and check at the backup chain
• Right click the missing restore point and select Forget or Remove from disk depending on what you want

Removing all Missing Backup Files from Backup
This shows how to remove all backup files that are missing from a backup. The cmdlet will remove the missing backup files and all files linked to it from the configuration database and from disk.

#Run the Get-VBRBackup cmdlet. Specify the Name parameter value. Save the result to the $backup variable
$backup = Get-VBRBackup -Name "Daily backups"
#Run the Remove-VBRBackupFile cmdlet. Set the $missingfile variable as the BackupFile parameter value. Provide the FromDisk parameter.
Remove-VBRBackupFile -Backup $backup -FromDisk

Add the -WhatIf parameter to check what will be done without applying anything

$backup = Get-VBRBackup -Name "Daily backups"
Remove-VBRBackupFile -Backup $backup -WhatIf -FromDisk