FTTH BDCOM OLT Backup Restore from FTP server

Backup::
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FTTH#copy startup-config ftp:BDCOM-OLT-Backup-Today
ftp user name[anonymous]?ftpusername
ftp user password[anonymous]?ftppassword
Remote-server ip address[]?ftp.tayabkhan.com
###############
FTP:successfully send 80 blocks, total size=40757
FTTH#

Restore::
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FTTH#copy ftp startup-config ftp.tayabkhan.com
ftp user name[anonymous]?ftpusername
ftp user password[anonymous]?ftppassword
Source file name[]?BDCOM-OLT-Latest-Backup-File
startup-config has existed, do you want to cover it(y/n)?y