@ nickjb,
I don't know what or how you shoot , so please take this advice with that in mind.
Do you really need access too all 3TB? That is an awful lot of files.
You might benefit from splitting your catalog up into 3 different type of photos, hot, warm, cold as in storage.
The hot, for current projects, warm for recent projects, and cold for archive .
Baring that could you use smart previews?
Or you could setup a VPN and have access to your photos, provided of course you have an Internet connection.
Or a mixture of the above.
Best of luck.
mdr