There are small SATA backplanes that allow you to fit 3 HDDs into two 5.25" slots (or 4 HDDs in 3 slots). You can find used ones for cheap (mine was 30€), and with some cheap tower case you could get something NAS-like with hot-swap drive bays for way cheaper
There are small SATA backplanes that allow you to fit 3 HDDs into two 5.25" slots (or 4 HDDs in 3 slots). You can find used ones for cheap (mine was 30€), and with some cheap tower case you could get something NAS-like with hot-swap drive bays for way cheaper