How Much NAS Storage for Video Editing?

The short answer: size for usable capacity, not drive-label capacity

A video-editing NAS should be sized from the space you can safely use after RAID or parity, filesystem overhead, snapshots and free-space headroom—not from the total capacity printed on the drives.

A practical planning formula is:

Required raw capacity = (active projects + archive + retained versions) / (RAID efficiency × usable-space target)

For many editing workflows, keeping roughly 20–30% of the NAS usable capacity free is a sensible starting point. The right figure depends on your filesystem, snapshot policy, workload and how much temporary media you generate. Treat it as planning guidance rather than a universal rule.

You also need to size a separate backup destination. RAID can keep a NAS running after some drive failures, but RAID is not backup.

Start with your video data rate

File size depends primarily on recording bitrate, duration and the number of camera angles. A useful estimate for decimal gigabytes is:

GB per hour = bitrate in Mbps × 0.45

Examples:

• 100 Mbps footage is approximately 45 GB per hour.
• 400 Mbps footage is approximately 180 GB per hour.
• 800 Mbps footage is approximately 360 GB per hour.

These are estimates. Audio tracks, metadata, variable bitrates, camera-generated folders and transcoding can change the final size.

For a project with several cameras:

Original media = hours × bitrate-derived GB per hour × number of camera sources

Do not estimate only from the final export. A finished 10-minute video may occupy a small amount of space while the camera originals, alternate takes, multicam angles and project files occupy hundreds of gigabytes or more.

Include more than camera originals

Build a line item for each type of data:

Data category	What to include
Camera originals	All cards, camera folders, audio and alternate takes
Working media	Proxies, optimized media and transcodes
Render and cache files	Preview renders, conform files, waveform caches and thumbnails
Project files	Timelines, libraries, databases, graphics and edit metadata
Exports	Review copies, masters, social versions and client revisions
Duplicates and versions	Previous cuts, alternate grades and retained deliverables
Archive material	Media and project files retained after delivery
Growth reserve	New projects, reshoots and larger future codecs

Render and cache data can be disposable, but it still affects the NAS while a project is active. Decide whether caches live on the NAS, on a local SSD, or on a dedicated scratch volume.

Separate the capacity calculations

1. Raw drive capacity

Raw capacity is the sum of the drive labels:

Raw capacity = number of drives × capacity of each drive

For example, eight 10 TB drives provide 80 TB of raw decimal capacity before RAID, filesystem overhead and free-space reserves.

Drive manufacturers normally label capacity in decimal TB, while operating systems may display a binary TiB value. That unit conversion alone can make the visible number look smaller. Do not treat the displayed value as lost RAID capacity.

2. RAID or parity capacity

RAID determines how much raw capacity is available for data and how the NAS handles drive failures.

Layout	Capacity effect	Practical editing implication
RAID 1	Approximately half of raw capacity with two mirrored drives	Simple and resilient, but inefficient for a large media library
RAID 10	Approximately half of raw capacity, with mirrored pairs striped together	Useful for workloads needing strong write and random-I/O behavior; drive-failure tolerance depends on which drives fail
RAID 5	Roughly one drive's worth of parity capacity	More usable capacity, but rebuild and failure considerations matter with large drives
RAID 6	Roughly two drives' worth of parity capacity	More fault tolerance, at the cost of additional capacity and write overhead
ZFS mirror or RAIDZ	Capacity and protection depend on the chosen vdev layout	Plan the vdev structure before buying; later expansion is not always as flexible as adding a drive to a traditional array

These are planning approximations. Actual usable capacity depends on drive count, filesystem formatting, pool layout, metadata, reserved space and the NAS operating system.

RAID 5, RAID 6 and RAIDZ parity layouts can be attractive for large video libraries, but they are not automatically the best choice for active editing. A parity array may provide more usable capacity than mirrored storage while offering different write behavior and rebuild risks. A mirror or RAID 10-style layout may be preferable for some high-write workflows, whereas capacity-focused archives may favor dual-parity designs.

3. Filesystem, metadata and snapshot overhead

After RAID, allow for the filesystem and NAS services:

• Filesystem metadata and allocation overhead
• ZFS record, checksum and copy-on-write overhead where applicable
• Snapshots and snapshot retention
• Recycle bins or deleted-file retention
• NAS applications, databases and indexing
• Temporary space used by synchronization or backup jobs

Snapshots are useful for recovering from accidental edits or ransomware, but they consume storage as changed blocks accumulate. They are not an off-device backup.

4. Free-space headroom

A NAS that is technically full is a poor editing workspace. Keep room for:

• New footage arriving before a project is organized
• Temporary renders and transcodes
• Large file copies that need staging space
• Snapshot growth
• Filesystem maintenance and normal performance
• A project that becomes larger than its original estimate

Use this formula:

Safe usable target = required stored data / (1 - headroom percentage)

If your stored data requires 20 TB and you want 25% of the usable pool left free:

Safe usable target = 20 TB / 0.75 = 26.7 TB

This is different from adding 25% to the data. Dividing by the remaining capacity percentage correctly reserves 25% of the final usable pool.

Worked example: sizing a NAS for several video projects

Assume the following workflow:

• Two projects are active at the same time.
• Each project has 1.5 TB of camera originals.
• Proxies and optimized media require 0.15 TB.
• Render and cache data requires 1.0 TB.
• Exports, revisions and project files require 0.6 TB.
• Four completed projects are retained in the archive.
• Each archived project needs 1.7 TB: 1.5 TB of originals, 0.1 TB of final masters and 0.1 TB of project files and assets.
• The NAS should keep 30% of its usable capacity free.

Active-project requirement

Per active project:

1.5 + 0.15 + 1.0 + 0.6 = 3.25 TB

Two active projects require:

3.25 × 2 = 6.5 TB

Archive requirement

Four completed projects require:

1.7 × 4 = 6.8 TB

Stored data before headroom

6.5 + 6.8 = 13.3 TB

Usable capacity after headroom

13.3 TB / 0.70 = 19.0 TB

The NAS therefore needs about 19 TB of usable capacity for this specific workload. That is usable capacity after RAID and before you begin filling the pool—not raw drive capacity.

If you expect the archive to grow to 12 projects, with 10 completed projects stored alongside two active projects:

• Active projects: 6.5 TB
• Completed archive: 1.7 × 10 = 17 TB
• Stored data: 23.5 TB
• With 30% free: 23.5 / 0.70 = 33.6 TB usable

A real purchase would need to exceed that estimate to account for filesystem overhead, snapshots, backup staging and differences between decimal TB and the NAS's displayed capacity. Check the NAS vendor's usable-capacity calculator for the exact drive count and RAID or ZFS layout.

The example also shows why a “one terabyte per finished video” rule is unreliable. Cache files and multiple active projects can dominate the working set, while archive requirements depend on how much original media you retain.

Plan for growth and retention

Estimate capacity over the period between NAS upgrades, not just for today's projects.

A simple annual-growth formula is:

Future data = current data + (new projects per year × average retained size × number of years)

Then apply your headroom target and RAID layout.

Consider these questions:

• How many projects will be active simultaneously?
• How many hours of footage arrive each month?
• Are you recording higher-bitrate or higher-resolution media in the near future?
• Will you retain camera originals, or only final masters and project files?
• How many revisions must remain available?
• Will proxies and render caches remain on the NAS?
• How long will clients or collaborators need access?
• Can the NAS add drives later, or must you replace drives with larger ones?
• Does the chosen ZFS pool or RAID group support the expansion plan you expect?

Expansion is not guaranteed to be simple. Some systems can expand a storage pool by adding a matching group of drives; others require replacing drives one at a time and waiting for rebuilds. Confirm the expansion method before choosing the initial number of bays.

A larger chassis also affects power use, noise, cooling and the cost of replacing multiple drives. For an editing studio, budget for the NAS, drives, network upgrades, backup storage and an uninterruptible power supply—not just the enclosure.

Size the backup separately

Your backup requirement is based on the data you need to restore, not on the RAID layout.

A practical approach is:

1. Keep the working copy on the NAS.
2. Keep a separate local backup or backup NAS.
3. Keep another copy off-site or in suitable cloud storage.
4. Use versioned backups so accidental deletion, corruption and ransomware are recoverable.
5. Test restoring a project, not just whether a backup job reports success.

You may exclude reproducible caches from the backup, but do not exclude original footage, project files, graphics, audio, master exports or any data that would be expensive to recreate.

If your protected dataset is 23.5 TB, a backup target advertised at exactly 23.5 TB is usually too small once versions, filesystem overhead and growth are included. Versioned backups can require substantially more space than one additional copy. Calculate the retention policy separately:

Backup capacity = protected dataset + changed-data versions + backup overhead + growth reserve

RAID protects availability against certain drive failures. It does not protect against deletion, malware, fire, theft, file corruption, a failed NAS, or a mistake replicated to every drive.

Performance requirements for video editing

Capacity tells you how much media fits. Performance determines whether editing is comfortable.

Estimate network throughput

For a rough network ceiling:

Bandwidth (Gbps) / 8 = theoretical GB/s

Or:

Bandwidth (Gbps) × 125 = theoretical MB/s

For example:

• 1 Gbps is theoretically 125 MB/s.
• 10 Gbps is theoretically 1,250 MB/s.

Actual file-transfer performance is lower because of Ethernet, TCP or SMB overhead, NAS processing, filesystem behavior, drive performance, RAID or ZFS layout, switch capacity and the client workstation. Every part of the path must support the intended link speed.

To estimate concurrent sequential demand:

Required media bandwidth = sum of simultaneous stream bitrates / 8

Add overhead for seeking, multiple audio tracks, multicam playback, scrubbing and background transfers. A compressed single-camera stream may play acceptably over a modest connection, while several high-bitrate streams, uncompressed intermediates or multiple editors can require much more bandwidth.

HDD pool, SSD workspace or SSD cache?

• A hard-drive pool can provide economical capacity for originals and archives.
• A local SSD can be effective for render and cache files that do not need central sharing.
• An SSD NAS pool can help when several editors need fast shared access, but it costs more per unit of capacity and still needs backup.
• SSD cache is not a guaranteed substitute for a faster storage pool. It may help repeated or suitable access patterns, but it does not make every large sequential video workflow faster.
• Cache configuration, workload, endurance and failure protection matter. A cache can also add complexity and consume usable drive bays.

For a single editor, keeping cache and scratch data on a fast local SSD while storing originals and project media on the NAS can be a practical design. For collaborative editing, evaluate the full workflow: shared project locking, file protocol, network switching, client connections and simultaneous stream count.

When ZFS is relevant

ZFS can be attractive for video storage because it provides checksumming, snapshots and flexible data-integrity features. Its pool layout, parity choice, memory requirements, record settings and expansion model need to be planned together. ZFS does not remove the need for backups, and a snapshot on the same pool is not an independent copy.

Other workloads can compete with editing

Surveillance recording, media serving, download services and backup jobs can consume capacity and I/O. Surveillance retention should be calculated separately:

Surveillance storage = cameras × bitrate × retention time

If the NAS will record cameras while editors work, consider separate pools, schedules, network limits or a dedicated recorder. Do not let continuous surveillance growth silently consume the free space required for editing.

NAS sizing checklist for video editing

Before buying, confirm the following:

• [ ] Camera bitrate, resolution, frame rate and hours per project
• [ ] Number of camera angles and simultaneous active projects
• [ ] Proxy, optimized-media and transcode requirements
• [ ] Render, cache and scratch location
• [ ] Project files, graphics, audio and exports
• [ ] Archive retention period and whether originals are preserved
• [ ] Number of revisions and client deliverables retained
• [ ] Expected annual growth and upgrade interval
• [ ] Raw drive capacity versus actual RAID or ZFS usable capacity
• [ ] Filesystem, metadata, snapshot and recycle-bin overhead
• [ ] At least 20–30% free-space headroom, adjusted for your workflow
• [ ] Backup dataset, version retention and off-site copy
• [ ] RAID fault tolerance and rebuild consequences
• [ ] Network speed from every editor to the NAS
• [ ] NAS, switch, cabling and workstation support for that speed
• [ ] Whether HDDs, SSDs, local scratch storage or a mixed design fit the workflow
• [ ] Drive bays and the actual pool-expansion method
• [ ] Power, cooling, noise and UPS requirements
• [ ] Separate capacity and performance impact from surveillance or other services

For the next step, Browse NAS options and compare them against your calculated usable capacity, drive layout, networking and expansion plan. You can also review NAS and storage servers when a video workflow needs more bays, connectivity or room to grow.