Cloud storage email scams are increasingly common. These messages are designed to make you believe your files are at risk — and push you into clicking a link or entering payment details before you have time to think it through.
A form of phishing, these “cloud storage full” scams exploit a simple fear: that your photos, documents, or backups are about to be deleted. Fake renewal pages are built to collect your payment details, phishing websites mimic real cloud services to steal your login credentials, and links redirect to products to generate affiliate revenue. In some cases, malicious websites attempt to install unwanted software on your device.
Some scam emails impersonate well-known providers like Apple, Google, or Microsoft to appear more credible. Others use generic names like “Cloud+” or “Cloud Storage,” but are designed to look convincing enough to create doubt. Here’s how to tell the difference, check your storage account safely, and avoid getting caught out.
- How to spot a cloud storage scam
- Examples of cloud storage scams vs. legitimate “storage full” emails
- What to do if you receive a cloud storage scam email
- Why you keep receiving cloud storage scam emails, and how to stop them
- Stay ahead of scammers with Proton
How to spot a cloud storage scam
Scammers rely on a consistent set of tactics. Before you act on or click any links in an email, check for these warning signs of a scam:
Unusual sender address: Messages often come from random domains or long, unreadable email addresses that don’t match the company being impersonated.
Generic branding: Names like “Cloud”, “Cloud+”, or “Cloud Storage” are commonly used instead of real product names.
Urgent or fear-inducing language: Warnings about your cloud storage getting full or files being permanently deleted on a specific date are a hallmark of phishing attacks, designed to pressure you into acting quickly.
Suspicious links: Links may redirect through unrelated domains or lead to fake login pages designed to mimic real services.
Fake account details or scans: Some messages include made-up account IDs, or links to fake pages that perform a “storage scan” and always report that your account storage is full.
Generic greetings: Messages often use “Hello” without your name, or address you by your email address.
Unrealistic offers: Massive discounts that sound too good to be true, such as “80% off upgrades” or “limited-time recovery deals”, are a strong indicator of a scam.
Examples of cloud storage scams vs. legitimate “storage full” emails
Cloud storage scams can be especially convincing because they often appear alongside real storage alerts from services such as iCloud, Google Drive, OneDrive, or Dropbox.
For Apple users, an iCloud scam may claim that your iCloud account has been blocked, your photos and videos will be deleted, your payment method has expired, or your cloud service has been disabled. The goal is to make you click a malicious link that leads to a fake login or payment page designed to steal your Apple ID or banking details. The Guardian(neues Fenster) provides a good example:
A legitimate “storage full” email is less threatening and will direct you to manage your storage through the official app or account settings. Go to Settings → [your name] → iCloud to check. If storage is actually full, the official account page will show the issue and provide safe options to manage or upgrade storage.
What to do if you receive a cloud storage scam email
If you receive a suspicious storage alert, follow these steps:
Do not click anything in the email
Cloud storage scam emails often include fake buttons or links such as “upgrade storage,” “renew account,” “claim free space,” or “fix payment.” These links may lead to phishing pages designed to steal your password, payment details, or personal information.
Do not click links, buttons, or attachments in the email.
Check your real cloud storage account directly
Log in to your real account directly, such as Proton Drive, iCloud, Google Drive, OneDrive, or Dropbox, and check your storage, billing, and security settings there. If there is a real issue, it will usually appear inside your official account.
Mark the email as spam or phishing
Simply deleting the email removes it from your inbox, but it does not help your email provider identify similar scams in the future.
Use your email provider’s “Report phishing,” “Report spam,” or “Block and report” option. This helps train spam filters and may reduce similar scam emails over time.
Do not reply to the sender
Replying can confirm that your email address is active. Scammers may then send more scams or sell your address to other spam lists.
Do not respond, even to say “stop” or “unsubscribe.” Instead, use only unsubscribe links from companies you recognize and trust. Proton Mail provides an auto-unsubscribe option to make this easier for you.
Delete the scam email after reporting it
Keeping scam emails in your inbox increases the chance that you may accidentally click them later.
After reporting the message as spam or phishing, delete it from your inbox. You can also empty your trash later to remove it completely.
Change your password and turn on 2FA if you clicked a link
If you clicked a link and entered your password, scammers may now have access to your cloud storage account or other accounts where you reuse the same password.
Change your cloud account password immediately by using a strong, unique password that you do not use anywhere else.
And, if you don’t already have two-factor authentication (2FA) enabled, make sure to turn it on for extra security. If a scammer has your password and tries to break into your account, 2FA can alert you by prompting for a second step, such as a code or approval request. If you receive a prompt you didn’t request, deny it and change your password immediately.
Check your account activity and payment details
If you entered login or payment information on a fake page, scammers may try to access your account, change settings, or use your card details.
Review recent account activity, connected devices, recovery email addresses, and payment methods to remove anything unfamiliar. If you have a paid Proton account, you can enable Proton Sentinel to help protect you from account takeover.
If you entered card details, contact your bank or card provider to freeze your card or account.
Report the scam
Cloud storage scams are part of larger phishing campaigns, and reporting them helps anti-phishing organizations track and fight these attacks.
Forward suspected emails to APWG (Anti-Phishing Working Group)(neues Fenster), an international nonprofit focused on fighting phishing, online fraud, email spoofing, malware, and related cybercrime. You can also report them to your email provider and the company being impersonated.
Why you keep receiving cloud storage scam emails, and how to stop them
Even after reporting and blocking, you might still keep receiving scam emails, and there are a few reasons why:
Your email address is on spam lists
Your email address may have appeared in a data breach(neues Fenster), on a public website, in a mailing list, or in a marketing database sold by a data broker. Once scammers have your address, they may repeatedly target you with cloud storage scams.
Dark web monitoring is a Proton Pass feature that checks whether your email has appeared in known breaches. You can also remove your email address from public pages where possible and use email aliases when signing up to online services or apps, to hide your true email address.
You opened, clicked, or replied to a scam email before
Opening a suspicious email can sometimes confirm your address is active, especially if the message loads tracking images. Clicking links or replying gives scammers an even stronger signal that your inbox is being monitored.
Do not click links, open attachments, or reply to suspicious messages. Access your cloud storage account only by typing the official website address or opening the official app, and turn off automatic image loading in your email settings. Proton Mail removes invisible tracking from every email you receive, to hide your email activity from senders.
Scammers rotate senders and domains
Blocking one sender may not stop the scams because scammers often change email addresses, domains, and display names. The next message may look similar but come from a completely different sender.
Report these messages as phishing instead of only blocking the sender, which helps your email provider recognize similar scams and improve filtering for future messages.
Your spam filter is still learning
Some scam emails are designed to bypass spam filters by using images instead of text, strange spacing, misspellings, shortened links, or compromised email accounts that appear more trustworthy.
Continue reporting scam emails as phishing, and create custom inbox filters for repeated phrases such as “storage full,” “cloud renewal,” “payment failed,” or “account suspended.” Also check your spam folder occasionally to make sure legitimate emails are not being filtered incorrectly.
Stay ahead of scammers with Proton
Cloud storage scams work because they target two things people care about: access to their inbox and access to their files. Protecting both makes it much harder for scammers to trick you, steal your information, or pressure you into handing over payment details.
Proton Mail helps protect your email from phishing attempts with spam filtering, phishing protection, custom filters, tracker protection, and simple reporting tools. It also protects your emails with end-to-end encryption and zero-access encryption, so your inbox stays private by default.
Proton Drive gives you a safer place to store and back up your important files, photos, and documents. With end-to-end encrypted cloud storage, your files are encrypted on your device before they’re uploaded, meaning no one — not even Proton — can access them without your permission.
If these scams have made you rethink where you keep your emails and files, Proton is easy to try. With a free Proton account, you get both Proton Mail and Proton Drive, giving you a more private inbox and secure cloud storage from the start.
