Find out how long your NAS storage will last based on your real data growth rate. Get a year-by-year projection, see when you'll need to upgrade, and find the cheapest expansion path.
This NAS storage capacity growth planner projects how long your current NAS will last based on total capacity, current usage, and your annual data growth rate. Outputs a year-by-year forecast showing when you'll hit capacity limits and compares drive expansion versus full NAS upgrade costs.
| Year | Data | % Full | Capacity | Status |
|---|
| User type | Typical starting data | Annual growth | Suggested minimum (5-year) |
|---|---|---|---|
| Family photos + docs | 500 GB – 2 TB | 150–200 GB/yr | 4 TB usable (2-bay RAID 1) |
| Photo + video enthusiast | 2–5 TB | 500 GB – 1 TB/yr | 12 TB usable (4-bay RAID 5) |
| Media collector (movies, music) | 5–20 TB | 1–3 TB/yr | 24 TB+ usable (4–6 bay) |
| Small business (5–10 staff) | 1–5 TB | 200–500 GB/yr | 8 TB usable (4-bay RAID 5) |
| Surveillance (4 cameras, 24/7) | 0 TB (fresh) | 2–4 TB/yr | 16 TB+ usable (4+ bay) |
| Homelab (VMs, Docker, AI) | 1–3 TB | 500 GB – 1 TB/yr | 12 TB usable minimum |
The most common NAS buying mistake: choosing a 2-bay to save $200, then needing a full replacement within 2 years. Here's why a 4-bay is usually the smarter investment.
A 2-bay NAS running RAID 1 gives you exactly half your drive capacity as usable storage, two 8TB drives gives you 8TB usable. There's no way to add more drives. The only way to expand is to replace the entire NAS enclosure.
A 4-bay NAS running RAID 5 gives you 75% efficiency, four 8TB drives gives you 24TB usable. When you need more space, you replace one drive at a time with a larger drive. A 2-to-4-bay upgrade requires buying a new NAS; a 4-to-6-bay expansion requires a new enclosure but not new drives in most cases.
The maths: the price difference between a 2-bay and 4-bay entry-level NAS is typically $200–300 AUD. If you need to upgrade your 2-bay after 2 years, you're spending that same $200–300 again on a new unit, plus migrating your data. The 4-bay pays for its premium up front.
The exception: if your data genuinely won't grow beyond what a 2-bay can handle for 5+ years, and you value the smaller footprint, a 2-bay is a legitimate choice. This planner helps you check that assumption with real numbers.