FreeFileSync Forum

I found the answer myself. FFS is included in the LM SW Manager.

To get FFS the Linux Mint SW Manager's settings need to be adjusted.

edit > SW sources > additional repositories > check Getdeb

This setting gives access to an ubuntu-trusty (14.04) repository.

I am running Linux Mint 17.3 on a notebook.

Using FFS, I want to synch my /home folder with a copy on an external HDD. Synch setting "mirror" my /home with a folder /homecopy.

Conditions:
1 - Notebook is in the docking base, which means the external HDD is connected
AND (not logical or)
2 - Any ...

Follow the explanations by @Pierry and especially to the last thing: Save your settings. I have several settings for synching several folders (never all) on to several HDDs. I click on one setting (which includes folder and drive information) and click "Synchronize". 2 clicks and FFS runs a complex ...

I am running Linux Mint 17.3 "Rosa" - KDE (64-bit. and 32-bit), which is based on Ubuntu 14.04 LTS.

Which version of FFS can I use?
Where can I download the needed version?

Thanks in advance!