My old 4TB external hard drive is the size of a brick. It is also heavy. It started to have problems where it sometimes won't let me access the hard drive. The hard drive seems to work, but maybe there is an electronics problem. Power cycling seems to fix it.
I replaced it with a 5 TB "portable" hard drive for $100. This seems like a great deal. I was amazed by the size. It is like 2 decks of cards side by side and lightweight. It also doesn't require a separate power supply.
It took 2 days to copy all the data. The new drive is somewhat slow on write speed because of SMR (https://en.wikipedia.org/wiki/Shingled_magnetic_recording). Also, I had to power cycle the old hard drive at least a couple of times.