Answer: There are a lot of choices
Explanation: do you want a database? You can obtain a terabyte or even larger size thumb drive or USB drive
Do want a print server? a networked drive specific for your data and if you have to print out anything
Do you want a connected drive to send all your documents to with organized folders? any size drive will work for this they come all prices
Enter the electronic filing system, sometimes called document management software. These computerized filing systems provide electronic file management. In other words, they give us a simple way to store, organize, and retrieve digital files and digital documents and pdfs.
https://www.filecenter.com/info-electronic-filing-system.html here is some good software