If you want to sql database log backup don’t shrink the following value add regedit.
REG ADD "HKEY_LOCAL_MACHINE\SOFTWARE\Arcserve\Unified Data Protection\Engine\AFBackupDll" /v DisableShrinkSQLLog /t REG_DWORD /d 1 /f
For agentless backup, navigate to the following key. Create the registry table value inside the VM that you want to back up on the proxy server. If there is no such registry table key, create the complete key path.
REG ADD "HKEY_LOCAL_MACHINE\SOFTWARE\Arcserve\Unified Data Protection\Engine\AFBackupDll" /v BackupSQLLog4Purge /t REG_DWORD /d 1 /f
Enable purging logs at hourly interval for SQL via a registry switch
REG ADD "HKEY_LOCAL_MACHINE\SOFTWARE\Arcserve\Unified Data Protection\Engine" /v PurgeSqlLogPerHour /t REG_DWORD /d 1 /f