Most Secure and Private Cloud Storage in 2026

pCloud ranks first among the most secure cloud storage services we tested. It pairs two-factor login with multiple copies of every file. Its Rewind tool rolls an account back to any point in the last 30 days, which undoes a ransomware attack. For privacy from the company itself, Internxt and NordLocker encrypt files before they leave your computer or phone.

That means neither company can open them. pCloud sells that protection as an add-on. We checked each service’s share links and file recovery in our October tests.

Security Features Compared

Service	End-to-end encryption	Two-factor login	Deleted files kept	Version history	Protected share links
pCloud	Paid add-on	Yes	30 days (15 on free plans)	30 days, 365 with add-on	Password and expiry on paid plans
Internxt	Every plan, with post-quantum layer	Yes	2 to 30 days, by plan	Premium and Ultimate plans	Password on paid plans
NordLocker	Every plan	Yes	Not kept	None	Security code and expiry date
Sync.com	Every plan	Yes	30 to 365 days, by plan	30 to 365 days, by plan	Password and expiry on paid plans
MEGA	Every plan	Yes	30 days	30 days, 60 on paid plans	Password and expiry on paid plans

How Each Service Protects Your Files

1. pCloud: Best Overall for Security and File Recovery

pCloud protects stored files with 256-bit AES encryption and transfers with TLS, then keeps five or more copies on at least three server locations. At signup, you choose whether your files are stored in Dallas, Texas, or in Luxembourg, and two-factor login blocks a leaked password from opening the account. Our test file, once deleted, was recoverable from pCloud’s trash. On paid plans, the trash and file revisions cover the last 30 days.

Rewind restores the entire account, or chosen folders, as they were on a date you select. That reverses a ransomware attack that encrypted synced folders. The Extended File History add-on stretches the window to a year, counted from the day you buy it. For zero-knowledge protection, where only you have the key, pCloud sells client-side encryption as a one-time purchase of about $150. Without it, the keys to stored files stay with pCloud.

A 2024 ETH Zurich study found that a compromised pCloud server could insert files into an encrypted account or swap in its own keys to read later uploads. pCloud called the attacks theoretical, and we found no announced fix. pCloud also had a privacy incident in February 2026, when users reported strangers’ files and folders showing up in their accounts.

The company told affected customers that a limited number of accounts had their folder structure exposed to other users, including file and folder names and modification dates. We found no public announcement of the incident. Our full pCloud review covers each plan.

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2. Internxt: Best for Sensitive Documents

Internxt‘s apps apply AES-256 and Kyber-512, a post-quantum algorithm, to every file before the upload begins. The keys stay in your account, so Internxt can’t open your documents, and free accounts receive the same protection. Connections use TLS 1.3, and files are stored in European data centers. Internxt’s claims are open to outside checks. The apps’ source code is public on GitHub.

Securitum, a Polish penetration-testing firm, has audited the platform twice, the second time in 2025. Two-factor login is available in the web app. Recovery depends on the plan. Restoring our test file from Internxt’s trash worked, but free accounts keep deleted items for only 2 days. Paid plans extend that to between 7 and 30 days, depending on the tier.

Premium and Ultimate add version history for PDF, Word, Excel, and CSV files. Lifetime plans start at about €285 for 1 TB, paid once, and our Internxt review lists every plan.

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3. NordLocker: Best for Locking Files Behind a Master Password

NordLocker encrypts files with AES-256 using a key derived from your master password, which it hashes with Argon2 and never stores. At signup, it generates a recovery key for a forgotten password. If you lose the password and the recovery key, NordLocker can’t unlock the files. Each share link in our October tests came with a generated security code and an expiry date of up to 14 days, so a forwarded link expires on schedule.

Multi-factor login is available through the Nord Account. Recovery is the drawback. Our test file was gone the moment we deleted it, and NordLocker offers no trash or earlier versions to recover it from. Back up important documents to another drive first. A 500 GB plan costs about $36 for its first year, and our full NordLocker review covers its apps.

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4. Sync.com: Best for HIPAA and Privacy Compliance

Sync.com applies end-to-end encryption by default, including on free accounts, and stores data in Ontario under Canada’s PIPEDA privacy law. Higher plans add HIPAA compliance for US healthcare data, and the company also lists GDPR and SOC 2 compliance. ETH Zurich’s 2024 study also covered Sync.com. Its researchers showed that a compromised server could add folders to an account, change file names, and replace encryption keys, and that shared links exposed decryption keys.

Sync.com later announced a fix for the link issue and said it would patch the others. Trash and file history last 60 days on the Personal 1 TB plan, 180 days on Pro Solo 5 TB, and 365 days on the unlimited plans. Our deleted test archive was restorable. A lost or stolen device can also be locked out of the account remotely. Sync.com spent 4 minutes 11 seconds uploading our 500 MB archive, the longest we timed.

The fastest cloud storage comparison lists every service’s times. Pro Solo 5 TB costs about $168 for the first year. More on its plans is in our Sync.com review.

5. MEGA: Best for Encrypted Chat and Calls Alongside Storage

MEGA applies end-to-end encryption to files, chats, and video calls, with keys protected by your password. Free accounts, with 20 GB of space, are encrypted the same way, and two-factor login works with an authenticator app. The company, based in Auckland, New Zealand, publishes its client source code for outside review. In 2022, ETH Zurich researchers showed that an attacker in control of MEGA’s servers could recover a user’s private key and decrypt stored files.

MEGA patched the two attacks that exposed data about three months after the report and said it knew of no compromised accounts. Follow-up research in 2023 described further attacks on the patched design. We recovered our deleted file from MEGA’s rubbish bin, which stores items for 30 days on free plans. Earlier versions are kept for 30 days, or up to 60 on paid plans. Protecting a link with a password or an end date is a Pro feature.

Paid plans start with Essential, about €48 a year for 200 GB, and bundle the MEGA VPN and MEGA Pass apps. Downloads count against a monthly transfer quota. MEGA and our top choice go head to head in our MEGA vs pCloud comparison.

Other Encrypted Services: Proton Drive and Tresorit

Proton Drive comes from the Swiss company behind Proton Mail and Proton VPN. It encrypts every file end to end, and free accounts have 5 GB with the same protection. Its phone apps back up photos and videos automatically, and the Drive Plus plan adds 200 GB for about $48 a year.

Tresorit, also based in Switzerland, sells end-to-end encrypted storage mainly to businesses. It was the least affected service in ETH Zurich’s 2024 study, where researchers flagged one weakness in how it verifies other users’ public keys. We haven’t run either service through our tests, so neither appears in the ranking.

Security Features to Look For

• Encryption keys: Google Drive, Dropbox, and standard iCloud accounts encrypt files with keys the company keeps. Zero-knowledge services encrypt on your device first, and our guide to encrypted cloud storage explains how it works. iCloud adds it only when Advanced Data Protection is enabled, a setting our iCloud alternatives guide explains.
• Account protection: Two-factor login requires a one-time code after the password, so a stolen password alone isn’t enough to sign in. The five services in our ranking support it, and NordLocker adds a recovery key for a forgotten master password.
• File recovery: A trash folder, version history, and account rollback undo deletions and ransomware damage. Recovery periods range from none on NordLocker to a year on Sync.com’s unlimited plans and on pCloud with its history add-on.
• Sharing controls: Passwords, expiry dates, and the option to revoke a link limit who opens a file after it leaves your account.
• Data location: Swiss, EU, and Canadian privacy laws restrict how companies use stored files. pCloud lets you choose the US or the EU, Internxt stores files in Europe, and Sync.com uses Canadian data centers.
• Transparency: Published source code and independent audits let outside experts verify a company’s claims, the same kind of evidence behind a trustworthy no-log VPN.

Private Cloud Storage: Self-Hosted or Zero-Knowledge?

Businesses use the term private cloud storage for servers they own and manage, often a NAS from Synology or QNAP or a Nextcloud installation. For individuals, it usually means a zero-knowledge service that stores files the company can’t read. A NAS keeps files on a device at home or in the office, so no company stores a copy. The owner takes on the security work instead: firmware updates, an off-site backup, and protected remote access.

Ransomware campaigns have targeted internet-facing NAS devices, including QNAP models hit by DeadBolt in 2022. Large video collections are a common reason to buy one, and our guide to cloud storage for videos covers online services that stream them. Zero-knowledge services such as Internxt and NordLocker take over that maintenance without gaining access to the files. A common setup pairs a home NAS with an encrypted cloud account as the off-site copy.

Encrypted Folders and Cloud Lockers

Three of the services let you put chosen files behind a second layer of protection:

• pCloud Encryption: files moved into the Crypto Folder are encrypted on your device and open only with a separate passphrase.
• NordLocker: every file is stored in a locker, and a locker can be shared with other NordLocker users by email.
• Sync Vault: an archive folder that doesn’t sync to your devices, so deleting a local file leaves the stored copy untouched.

How We Checked Security

For our October tests, we signed up for the five services on a Windows 11 test PC in Europe and sent a 500 MB archive through every desktop app. We set up share links to see which protections were available, and deleting the archive afterward showed which services could restore it. Two-factor login, data locations, audits, and paid-plan recovery features come from each company’s documentation.

Conclusion

Choose by the threat you want covered. Against a stolen password, a failed drive, or ransomware, pCloud offers the most complete protection we found, and its encryption add-on covers files the company shouldn’t see. If the main concern is the storage company reading your files, Internxt encrypts everything before upload and has two audits behind it.

NordLocker protects a small set of confidential files well, though its deletions are permanent. Sync.com brings compliance and up to a year of recovery, and MEGA adds encrypted chat to its 20 GB free plan. For speed and price comparisons, see our best cloud storage guide.

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