RAID & NAS Data Recovery Cost UK 2026: Rebuilding Failed Arrays & NAS Drives
Direct answer: RAID and NAS data recovery is priced by complexity — the number of disks, RAID level and whether the failure is in the controller or drives. Surviving disks and parity may allow a virtual rebuild, but recovery is not guaranteed. Celltech confirms diagnostic, recovery, third-party and return-delivery charges and the bespoke quote before work begins.
A failed NAS or RAID array is a higher-stakes failure than a single dead drive, because it usually holds the consolidated archive of a small business, a creative studio or a committed home-lab owner — and because the very feature that was supposed to protect the data, redundancy, tends to breed a false sense of security. People run a two- or four-disk RAID expecting it to be safe, skip the backups, and then discover that a RAID is not a backup: it protects against a single disk failing, not against multiple disks failing, a controller dying, or a rebuild going wrong. The encouraging part is that a failed array is, in most cases, rebuildable — provided nobody makes the one mistake that genuinely destroys the data first.
This page is the RAID & NAS spoke of our data recovery hub. It covers what NAS and RAID recovery costs, why an array failure is usually recoverable, the dangerous DIY step to avoid, and how business data is handled. For related failures see hard drive recovery and SD card recovery, and book through the hard drive recovery service.
RAID & NAS recovery price guide
RAID and NAS work may require multiple disks to be imaged, a virtual array to be reconstructed and a damaged file system to be analysed. Check the live data recovery page for current service tiers. Multi-disk arrays are quoted after diagnosis, with the exact scope and all potential charges confirmed before work begins.
| Array type / scenario | Complexity | Pricing basis |
|---|---|---|
| Single-disk NAS (no RAID) | Equivalent to one-drive recovery | £149–£399 typical |
| RAID 1 mirror, one disk failed | Mirror rebuild from surviving disk | £299–£599 band |
| RAID 5 / 6, one or two disks failed | Parity rebuild across surviving members | Bespoke, post-diagnosis |
| Multi-disk array, clean-room needed | Multiple mechanical drives + virtual reconstruction | Up to £999 |
What drives the cost
- Number of disks. Each member disk has to be imaged before any reconstruction, so a six-disk array is more work than a two-disk mirror.
- RAID level. RAID 1 (mirror) is the simplest rebuild. RAID 5 and 6 (parity) need a virtual reconstruction from the surviving members. RAID 0 (striping, no redundancy) has no margin for error — every member must be readable.
- Controller vs disk failure. If the NAS controller or enclosure has failed but the disks are healthy, recovery can be as simple as reading the disks in the correct order. If the disks themselves have failed, each one is a drive-recovery job in its own right before the array can be rebuilt.
- Rebuild damage. If a failed rebuild has already overwritten parity or restriped data across the array, recovery is harder and sits higher in the range (see the next section).
- Encryption. An encrypted NAS volume adds a decryption step, which needs your password or recovery key.
Why a failed array usually is not lost data
The reason RAID feels catastrophic — "the whole array failed” — is also the reason it is usually recoverable. RAID spreads data across multiple disks using striping (splitting files across disks for speed) and, on RAID 5 and 6, parity (mathematical redundancy that lets the array rebuild a missing disk from the others). When an array "fails", what has usually happened is that enough disks have dropped out to push the array past its tolerance — but the data is still sitting on the surviving members, encoded across them.
Recovery works by imaging each surviving disk bit-for-bit on write-blockers (so nothing can change during the process), then virtually reconstructing the array in software — re-stripping the data and re-applying the parity maths — to produce a single readable volume. The original disks are never written to during this process. That virtual reconstruction is the specialist skill that most general repair shops do not have; see our clean-room recovery explainer for the wider process.
The mistake that destroys arrays: do not rebuild / resilver first
This is the single most important warning in the article, and it accounts for a large share of the genuinely unrecoverable cases we see. When a NAS reports a degraded array or a failed disk, its first suggestion is usually to "rebuild" or “resilver” — to insert a fresh disk and let the array reconstruct onto it. If the remaining disks are themselves marginal — and in an array that has already lost a disk, they very often are — that rebuild reads every block of every surviving disk under heavy load, which is exactly what pushes a borderline disk into failure.
Worse, if the rebuild starts onto a disk that has been wiped, or onto the wrong disk, the array may start overwriting its own parity and restriping across the surviving data — destroying the very redundancy that would have allowed recovery. Once a failed rebuild has overwritten the array, the data is often gone for good. The correct action is the opposite of what the NAS suggests: power the NAS down and do not attempt a rebuild. Image the disks first, reconstruct virtually, and only then — on a copy — consider rebuilding. We will tell you exactly that on a diagnosis.
RAID 0 / 1 / 5 / 6 / 10 — what failure means for each
- RAID 0 (striping). Speed with no redundancy. One disk fails and the whole array is gone — but recovery is possible if every member disk is still readable, by re-striping.
- RAID 1 (mirror). Two identical copies. Lose one disk and the mirror rebuilds from the survivor — the simplest recovery.
- RAID 5 (parity). Tolerates one disk failure. Lose a second disk and the array is degraded; recovery rebuilds from parity across the survivors.
- RAID 6 (double parity). Tolerates two disk failures. The most forgiving common level for recovery.
- RAID 10 (mirror + stripe). Mirrored pairs striped together. Recovery follows the mirror logic per pair.
Business data: confidentiality and chain of custody
NAS and RAID failures often involve business data such as client files, accounts and project archives. Discuss any NDA, chain-of-custody, retention or secure-deletion requirements before booking. Diagnostic, recovery, third-party, inbound-carriage and return terms are confirmed for the case before work; customers arrange suitable tracked inbound postage using the order instructions.
Sending a NAS or disks in
Follow the order-specific packing instructions for the NAS enclosure or bare disks, preserving and labelling the original bay order. Customers arrange suitable tracked inbound postage with appropriate cover. We diagnose under the stated terms and confirm the recovery scope and quote before work. Qualifying board or controller repair work carries the stated 120-day guarantee; the recovery outcome itself is not guaranteed.
FAQs
How much does RAID data recovery cost in the UK?
It is priced by complexity, including the disk count, RAID level and whether the controller or media failed. Check the live service tiers; multi-disk arrays receive a case-specific quote after diagnosis.
Can you recover a RAID 5 array with two failed disks?
Often, yes, provided the rebuild has not overwritten the surviving data. RAID 5 tolerates one disk failure officially, but with two down we can frequently still reconstruct from parity and the surviving members — as long as nobody has attempted a rebuild first.
My NAS says the volume crashed — is my data gone?
Probably not. A crashed volume is usually a file-system or controller problem on top of intact data. We image the disks and reconstruct the volume virtually.
Should I let the NAS rebuild / resilver itself first?
No. A rebuild reads every block of the surviving disks under load and can push a borderline disk into failure, or overwrite parity if the wrong disk is used. Power the NAS down and image the disks before any rebuild.
Do you recover Synology / QNAP NAS drives?
Yes. Synology and QNAP are the most common NAS enclosures we see, typically running RAID 1, 5, 6 or 10. We recover the array regardless of enclosure.
Is my business data kept confidential?
Yes. We work in a controlled environment, image to encrypted storage, and can provide a documented chain of custody. We are happy to agree NDAs and handling requirements before you send anything.
Do I pay if recovery fails?
Recovery is not guaranteed. Diagnostic, recovery, third-party and return-delivery charges, including any outcome-based terms, are confirmed before work begins.
Can you recover an encrypted NAS volume?
Yes, provided you have the password or recovery key. The data is recoverable; the encryption is decrypted with your credentials.