Your answer could potentially help me un-fuck my website!
Edit: The total capacity is currently 160 GB, so no amount of pruning will free up 1 TB. I need to mount an external share or something.
Edit2: I'm trying this but the command isn't working despite zero exit status.
regarding your cgnat idea you can try to work with an ssh tunnel between your PC and the VPS to bridge them and do what you were planning to by mounting