Too late
You can't make any money from your spare space. A couple of months ago I rounded up all my spare hard drives (about 1.5 TB) and started farming. The "estkimated time to win" started off at 10 years and got higher as more people added their HDDs to the network. God knows what it would be now. To have any chance of getting a payout you need to invest in 100s of TB. When I gave up I was competing with 24 EiB of network space or 28,000,000,000,000,000,000 bytes.