Q: How to map anonymous FTP user to folders outside /home/ftp/?

1. Read General Notes
2. Read How to install FTP Server for File Transfer service?

3. sudo cp /etc/proftpd.conf /etc/proftpd.conf_backup
   sudo gedit /etc/proftpd.conf

4. Append the following lines at the end of file

   <Anonymous /location_of_folder/>
     User                        ftp
     Group                       nogroup
     UserAlias                   anonymous ftp
     DirFakeUser on ftp
     DirFakeGroup on ftp
     RequireValidShell           off
     MaxClients                  10
     DisplayLogin                welcome.msg
     DisplayFirstChdir           .message
     <Directory *>
       <Limit WRITE>
         DenyAll
       </Limit>
     </Directory>
   </Anonymous>

5. Save the edited file (sample)

6. sudo /etc/init.d/proftpd restart