Well, you have a bit of work here! The first thing is how far you want to go.
The hard path is taking your system apart to pull out the HDD following this guide Sostituzione hard drive Mac Mini, versione fine 2014 and then install the replacement drive Mac mini Model A1347 Late 2014 SSD Upgrade Kits. You then still need to access your old HDD externally to try to recover the data.
The easy path is to add in the needed ribbon cable connector and a blade SSD OWC Aura Pro X2 MacMini Add-On Kit and here’s the guide to install it Mac mini Late 2014 PCIe SSD Cable Replacement. As we are leaving the HDD in its place we can access it using its current connection once we get the system setup with the new drive.
OK so thats the hardware side of the issue. Now the fun part of getting your system setup with an OS. Your other Mac is using an OS thats too old for your Mac Mini so we can’t use its OS for your mini’s recovery directly. We will need to download from Apple the a newer OS. I recommend you install Sierra macOS 10.12 on your Mac mini.
So, after ordering the needed kit and getting a fresh USB thumb drive …
Step 1 Is to download the image file from here How to upgrade to macOS Sierra jump down to Step 4 for the direct link to the file you’ll need.
Step 2 Is to prepare a 16 or 32 GB thumb drive on your other Mac. Using Disk Utilities format the thumb drive with GUID and a Journaled file system.
Step 3 Is to follow this guide How to create a bootable macOS Sierra installer drive from your working Mac.
Step 4 Is to install the SSD (either way)
Step 5 With the thumb drive plugged in, restart your Mac mini and press the Option (⌥) key on your keyboard to get to the Startup Manager, select the thumb drive at which point you should be able to then format the new SSD (again GUID Journaled file system) and install the OS to the drive.
Reference: Mac startup key combinations
Once your system is running try running Disk Utilities > Disk First Aid function on your HDD see if you can get it going enough to copy off to your new SSD what you need to save. I would then reformat the drive hopefully you can get a bit more life out of it.
Let us know how it goes!
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