You could get this 4 bay hard drive dock takes upto 10tb hds for $100 and swap drives when needed. Remember to store the drives in a ideal location when not in use. I have the same hard drive dock I have had for 2 years now no problem so far. https://www.amazon.com/ORICO-Docking-Station-Duplicator-Black/dp/B07G2WRB97/ref=sr_1_6?keywords=5+bay+hard+drive+dock&qid=1636409186&qsid=140-7136535-2841351&sr=8-6&sres=B07MQCDVJ2%2CB00DWHLFMA%2CB00MA1N8GA%2CB07G2WRB97%2CB07CSG4XM...
Use this external 4 bay hard drive dock with 4 2tb hard drives https://www.amazon.com/ORICO-Docking-Station-Duplicator-Black/dp/B07G2WRB97/ref=pd_ybh_a_4?_encoding=UTF8&psc=1&refRID=3H69ZSXPMKEHV220CFWR
This is a start * https://www.amazon.com/ORICO-Docking-Station-Duplicator-Black/dp/B07G2WRB97/ref=pd_ybh_a_4?_encoding=UTF8&psc=1&refRID=3H69ZSXPMKEHV220CFWR , https://www.amazon.com/10TB-Elements-Desktop-Drive-WDBWLG0100HBK-NESN/dp/B07G3QMPB5/ref=sr_1_1?crid=1FABKVT48V2Q7&keywords=10tb+western+digital&qid=1575975836&sprefix=10tb+western%2Caps%2C212&sr=8-1 ,https://www.amazon.com/Easystore-12TB-External-Hard-Drive/dp/B07YQ85LXN/ref=sr_1_16?crid=1FABKVT48V2Q7&keywords=10tb+western+digital&qid=1575975836&sprefix=10tb+western%2Caps%2C212&sr=8-16 You can shuck either of the hds the hd dock takes 4 10tb hds you can also replace 1 or 2 drives when they get close to full easy to switch drives. I am looking to get that hd dock soon myself would be nice to have 6 or 8 hds to use with it.