Estimate how much NAS capacity you may need based on your current files, annual storage growth and how many years you want your NAS to last.
Then see whether a 2-bay, 4-bay or larger NAS may be the better fit for your storage plan.
Calculate My NAS Storage ↓Your current data is only the starting point. Photos, videos, computer backups and media libraries can continue growing for years after you buy your NAS.
How much data are you storing today?
How much additional data do you expect each year?
How many years should the NAS support you?
Leave space for growth, snapshots and unexpected needs.
Enter a few estimates below. The calculator adds future growth and a 25% storage reserve before suggesting a NAS size.
Storage requirements can be very different depending on how you use your NAS.
Computer backups, documents and family phone photos often fit comfortably within a well-planned 2-bay NAS.
Explore 2-Bay NAS →RAW images and high-resolution photo libraries can grow quickly, making a 4-bay system attractive.
Explore 4-Bay NAS →4K movies and TV libraries can consume capacity quickly. Four bays or more provide significantly better expansion.
Explore 4-Bay NAS →High-bitrate 4K, 6K and 8K footage can justify six, eight or more drive bays.
Explore 6–8 Bay NAS →*Examples include approximately 25% planning headroom. Actual usable capacity depends on drive sizes, RAID configuration and NAS operating system.
Capacity is not the only consideration, but anticipated usable storage is a useful starting point.
A good fit for modest storage needs, home backup, personal cloud storage and smaller media libraries.
Four bays provide substantially greater storage flexibility without moving into a large NAS chassis.
Consider larger systems for professional video, extensive media libraries, businesses or heavy growth.
RAID redundancy uses some drive capacity to protect against drive failure.
One drive mirrors the other, so you do not normally receive 24 TB of usable storage from two 12 TB drives.
In a basic four-drive RAID 5 example, capacity roughly equivalent to one drive is used for parity.
Important files should ideally exist in more than one independent location. Your NAS may become your primary storage or backup destination, but it should not be the only copy of irreplaceable data.
It depends on how much data you currently have and how quickly it is growing. A household with only a few terabytes of files may be well served by a 2-bay NAS, while families with large photo, video and media libraries may benefit from four bays or more.
Planning roughly three to five years ahead is a useful starting point for many users. Rapidly growing photo, video or media libraries may justify planning farther ahead or choosing a NAS with more drive bays.
Not necessarily. Some NAS platforms allow you to begin with fewer drives and expand later. However, expansion rules vary by RAID type, drive size and NAS operating system, so check the manufacturer's requirements before choosing your initial configuration.
Eight terabytes can be plenty for documents, computer backups and moderate photo storage, but large video collections or rapidly growing families may outgrow it. Consider future growth rather than current usage alone.
That depends heavily on the quality and number of movies and TV episodes you store. High-bitrate 4K media can use substantially more space than compressed 1080p content. Estimate your annual media growth before selecting capacity.
Usually yes. Redundant RAID configurations dedicate some capacity to mirroring or parity, so usable capacity is lower than the sum of the drive labels.
No. Bay count mainly affects storage capacity and RAID flexibility. Processor performance, RAM, drive type, network speed and workload can all influence overall NAS performance.
Once you know roughly how much usable storage you need, compare the NAS systems that can support your plan.