Looks for Domain Controller Authenticated for current login user:

C:\>echo %logonserver%
\\GFLDC3

C:\>set L
LOCALAPPDATA=C:\Users\testuser\AppData\Local
LOGONSERVER=\\GFLDC3

Looks for Domain Controller Authenticated for current computer:

C:\>nltest /DSGETDC:
           DC: \\DC01.domain.local
      Address: \\10.0.0.100
     Dom Guid: abc33e3-1f7f-42a8-904d-358f2400gfh
     Dom Name: domain.local
  Forest Name: domain.local
 Dc Site Name: DCsite01
Our Site Name: DCsite01

Check which Domain Controller applied group policy to current computer and user:

Note: as show in the below result after running the command, user and computer get group policy apply from different DC

C:\gpresult /r

COMPUTER SETTINGS
------------------
    OU info
    Group Policy was applied from:      DC01.domain.local
    Group Policy slow link threshold:   500 kbps
    Domain Name:                        domain
    Domain Type:                        Windows 2008 or later

COMPUTER SETTINGS
------------------
    OU info
    Group Policy was applied from:      DC02.domain.local
    Group Policy slow link threshold:   500 kbps
    Domain Name:                        domain
    Domain Type:                        Windows 2008 or later

Robocopy example

robocopy c:\temp\source c:\temp\destination /E /COPYALL /DCOPY:DAT /R:100 /W:3

robocopy c:\temp\source c:\temp\destination /E /xo /fft /COPYALL /DCOPY:DAT /R:100 /W:3 /LOG:C:\temp\robocopylog.txt

/E : copy all subfolder include empty folder
/COPYALL : create completely identical copy include NTFS owner and auditing information
/DCOPY:DAT : copy for director, D stand for data, A stands for attributes, T stands for time-stamps
/R:100 : number of retries on failed copies for 100 times, if a file is locked
/W:10 : wait for 10 seconds before retries
/xo : Source directory files older than the destination are excluded from the copy.
/fft : Assume FAT File Times (2-second date/time granularity)
/LOG:C:\temp\robocoylog.txt  : write log to C:\temp\robocoylog.txt
/MIR : mirror