Reference

NAS (network-attached storage)

A NAS is a small storage appliance with its own drives that connects to your home or office network, so every device can read and write files to it over Wi-Fi or Ethernet. It acts like a private cloud you own — useful for backups, media, and offloading photos from a full phone.

Cloud & backupGeneral

NAS (network-attached storage)

Also known as: network-attached storage, home NAS, NAS drive, personal cloud

A private storage appliance on your own network
No monthly fee, but you maintain and back it up
RAID guards against drive failure, not disasters

How a NAS works

A NAS is a dedicated box holding one or more hard drives or SSDs, plugged into your router. It runs lightweight software that shares folders across the network, so phones, laptops, and TVs reach the same files at home or, with remote access set up, from anywhere.

Multi-drive units can use RAID to mirror data across drives, so one drive failing does not lose your files. That redundancy guards against drive failure but is not a substitute for an offsite backup, since theft, fire, or accidental deletion can still take the whole unit.

NAS vs cloud storage

A NAS is storage you own outright: one upfront cost, no monthly fee, and full control over your data, but you maintain it and provide your own offsite copy. Cloud storage like iCloud or Google Drive is rented — a subscription, run and backed up by the provider, reachable anywhere with no hardware to manage.

For phone cleanup, a NAS is a place to move large photo and video libraries off the device, often via the maker’s mobile app with auto-upload. Many people pair both: a NAS as the main local library and a cloud service as the offsite safety copy.

Related terms

Keep reading the reference.

Cloud & backupLocal vs cloud storageLocal storage is the fixed physical space inside your device that holds files even offline. Cloud storage is online space on a provider’s servers that you reach over the internet. They are separate pools — adding cloud storage does not enlarge the device, and a full device can coexist with an empty cloud.General Storage conceptsExternal hard driveAn external hard drive is a storage drive in its own case that connects over USB to add space outside your computer or phone. It is a cheap way to offload large photo and video libraries and keep backups, freeing room on the device’s built-in storage.General Cloud & backupCloud storageCloud storage keeps your files on a provider’s servers and syncs them to your devices over the internet — iCloud, Google Drive, OneDrive, and Dropbox are the common services. It is separate from a device’s built-in storage, so moving files to the cloud can free local space, but only if local copies are removed.General Cloud & backupDevice backupA device backup is a copy of your data — apps, settings, messages, and media — saved to the cloud or a computer so you can restore it after a reset, loss, or new device. A backup is a copy, not freed space: it never reduces the storage used on the device itself.General

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