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By Alex Diaz · How we calculate this
A two-bay enclosure starts around $150, a four-bay box runs $400 to $650, and eight-bay units built for small offices climb past $1,000 before a single drive goes in. Fill those bays with NAS-rated hard drives at $90 to $150 each, or pay two to three times as much per terabyte for SSDs instead, and the drives can end up costing more than the box itself. The drives and the box are both one-time purchases, so this is really a few-months-of-savings decision rather than a single-paycheck one.
These key factors affect home NAS server affordability
The drives usually cost more than the box
Bay count sets the entry price: two-bay enclosures start around $150, four-bay units run $400-650, and anything bigger climbs fast from there. Add NAS-rated hard drives at $90-150 each and a fully populated four-bay build tacks on another $400-600 in drives alone. SSDs cost two to three times as much per terabyte but run quieter and faster, which matters more in some setups than others.
RAID redundancy trades capacity for safety
Running drives in RAID 5 or 6 sets aside one or two drives' worth of capacity purely for parity, storage that never holds a single file. That's the trade being made: pay for more raw capacity than you'll actually use so the array can survive one drive dying without losing everything on it.
Ongoing electricity and backup costs
A NAS left running around the clock draws roughly 20 to 40 watts, which works out to something like $3 to $8 a month depending on local rates, not much on its own but real over a few years. RAID only guards against a drive failure, though, so anyone serious about not losing photos or files still needs an actual offsite or cloud backup on top of it.
How to use your results
- If the total feels risky, start with a two-bay enclosure and two drives in a mirrored setup, which costs roughly half of a four-bay build while still protecting against a single drive failure.
- Decide how much storage you actually need based on your current file sizes rather than buying maximum capacity upfront, since drives can usually be added or upgraded later.
- Add the ongoing electricity draw and any cloud backup subscription to your monthly budget, not just the one-time hardware cost.
Ways to make a home NAS server more affordable
- Repurpose an old desktop PC with free software like TrueNAS instead of buying a dedicated enclosure, which eliminates the hardware cost entirely aside from drives.
- Buy refurbished enterprise drives from reputable sellers, which often cost 30 to 40 percent less than new consumer NAS drives with similar remaining lifespan.
- Start with two drives instead of four and expand the array later as your storage needs actually grow, rather than provisioning for capacity you may not use for years.
- Watch for annual sales on NAS enclosures from major brands, which are frequently discounted 15 to 25 percent around November and during manufacturer refresh cycles.
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