FreeFile Sync

[ameerat42]

Brigitte.

1) Do you just want to back up your files regularly? - Like once a day/week?
What is your operating system? If Win 10, just use that backup system. Some new
external HDDs come with backup software, but it's hardly worth installing when you
already have one.

2) Or do you just want to transfer files ad hoc to the external drive. Well, Win
File Manager can be a bit limiting but it works. For this sort of thing (actually
transferring image files between drives) I use FastStone Image Viewer*, a free
program. The good thing about it is that it can be used to view files on your
camera card w/o removing it. It is visual, intuitive to use, and has handy bulk
file xfer capability among other things.

3) If you want to make (fairly) identical backups of your images then perhaps
Winmerge is what would help.
If you could provide a bit more info on your needs and on your OS it would be good.

* NB: The first one only on that page.

- - - Updated - - -

Actually, your Freefile Sync looks to be an equivalent of Winmerge. From its
description it looks manageable.