@m @TimmyMac wonderful, thank you both for your comments.
I need to dig into this... I may do it for my old Macbook Air (2013) that I used daily up until recently. I just realized that I need to preserve my Macbook Pro 2011 because it's the only device I have that still has native Firewire 400 and Firewire 800 ports ๐
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Anyway, I'll do some research on the subject and will definitely document my steps if I go down this route (I see that a basic NAS is around 300 Euros... not cheap but also a time saver IMHO)