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Everyone is talking about crypto mining, and the requirements for mining coins has gone way beyond something that is profitable. If you have 550GB free space on any server and supports docker, you can try to mine STORJ (https://storj.io). The price of the token is $1.18 USD right now. Fair warning, it takes atleast 6 months to really see tokens flow in, as your node gets slowly filled up and gets a good reputation.
If folks are interested, I will do a write-up on how to set this up.
Getting storage servers on deals, I have about 7.5TB spread across 4 servers (1x1.5TB Servarica, 1x2TB Servarica, 2x2TB Greencloud), I need to make about 20 $STORJ per month to be profitable. Sometimes it is frustrating, I had to reset the 1.5TB Servarica node twice in two years, losing about 10 $STORJ in the process. I have my reservations, but for some reason, I am persisting with this. It appears easier to mine than CHIA or FILECOIN