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I have a 4-drive Qnap array from about 2010 or so. It's slow, no longer supported, but continues to work well enough for what I want. With 4 * 3TB drives in a RAID5 arrangement I have about 8.5TB of available space and I've never managed to fill it.
If/when you do come to buying the disks, be careful of the magnetic recording method. (Assuming you go with spinning platters.)
The SMR (Shingled Magnetic R-something) is glacially slow due to the way the drive writes the data. Avoid them at all costs and only by the CMR drives.
The WD 'Red' NAS-rated drives under 3TB are SMR and CMR in the larger capacities. (I found out the hard way when one of my 3TB 'Red' drives died and had to to some serious research to find out which new drive was OK.)
If you're going with SSD, then this is totally irrelevant to you. (Just be aware that SSD drives have a finite number of write cycles before they kick the bucket.)
Cheers,
V
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