How to copy in HDD externe ?

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Welcome to ask.fedoraproject.

If your external hard drive is not mounted use:

root ~ # fdisk -l

to find your partition, and then mount it:

root ~ # mkdir /YOUR-MOUNTPOINT-NAME-HERE(MAKE IT UP)
root ~ # mount /dev/sdb1 /YOUR-MOUNTPOINT-NAME-HERE

Note that /dev/sdb1 is just an example, and you need to find the device name of your device, with f.e.k.s fdisk -l

Side note:

If you want to make the mount automatic and survive reboots, edit your /etc/fstab

then:

root ~ # df -h

should show your new mounted partition:

Filesystem                       Size  Used Avail Use% Mounted on
/dev/mapper/fedora_Hostname-root   89G   99M   84G   1% /
devtmpfs                         5.8G     0  5.8G   0% /dev
/dev/sda2                        477M  113M  335M  26% /boot
/dev/sda1                        200M  9.7M  191M   5% /boot/efi
external-hard-drive                ?G  584K  ?G   1% /YOUR-MOUNTPOINT-NAME-HERE

If you need to copy a few files from your external hard drive to your local drive use the cp command. For information on commands type in the terminal:

man YOUR-COMMAND-HERE

Example:

man cp

Output(some of it):

CP(1)                            User Commands                           CP(1)  

NAME
       cp - copy files and directories

If you want to backup, restore or copy large files or a lot of data, use rsync:

man rsync

rsync(1)                                                              rsync(1)

NAME
       rsync - a fast, versatile, remote (and local) file-copying tool

SYNOPSIS
       Local:  rsync [OPTION...] SRC... [DEST]

       Access via remote shell:
         Pull: rsync [OPTION...] [USER@]HOST:SRC... [DEST]
         Push: rsync [OPTION...] SRC... [USER@]HOST:DEST

       Access via rsync daemon:
         Pull: rsync [OPTION...] [USER@]HOST::SRC... [DEST]
               rsync [OPTION...] rsync://[USER@]HOST[:PORT]/SRC... [DEST]
         Push: rsync [OPTION...] SRC... [USER@]HOST::DEST
               rsync [OPTION...] SRC... rsync://[USER@]HOST[:PORT]/DEST

       Usages with just one SRC arg and no DEST arg will list the source files
       instead of copying.

DESCRIPTION
       Rsync is a fast and extraordinarily versatile file  copying  tool.   It
       can  copy  locally,  to/from  another  host  over  any remote shell, or
       to/from a remote rsync daemon.  It offers a  large  number  of  options
       that  control  every  aspect  of  its behavior and permit very flexible
       specification of the set of files to be copied.  It is famous  for  its
       delta-transfer  algorithm,  which  reduces the amount of data sent over
       the network by sending only the differences between  the  source  files
       and  the  existing  files in the destination.  Rsync is widely used for
       backups and mirroring and as an improved copy command for everyday use.

       Rsync finds files that need to be transferred  using  a  "quick  check"
       algorithm  (by  default) that looks for files that have changed in size
       or  in  last-modified  time.   Any  changes  in  the  other   preserved
       attributes  (as  requested by options) are made on the destination file
       directly when the quick check indicates that the file’s data  does  not
       need to be updated.

Here is the rsync command I use:

My rsync command:

Dry run(Dry run means a test run, nothing is copied):

rsync -vrnh --progress /home/user /BACKUP/Backup/

Real thing:

rsync -hvr --progress /home/user /BACKUP/Backup/

Backup/Update:

rsync ...