Hi
,
You can set the Log backup retention via SnapCenter PS cmdlet
Set-SmPolicy -PolicyName 'logbkup' -PolicyType Backup -Description 'Log backup Policy' -retentionsettings @{"BackupType"="LOG_SNAPSHOT";"RetentionCount"="3"} -PluginPolicyType "SCSQL" -sqlbackuptype 'logbackup' -CreateLogFolderSnapshot