New Private mailboxes: backed up, never readable
Email backup for any IMAP mailbox
KumoBunker backs up your email every day from the provider you already use and keeps a history of earlier days. Lost a message or a whole folder? Find it in your browser and put it back.
Start a free 14-day trial. No credit card, nothing to install.
Folders
Backup of Tue 29 Sep, 02:00
4,812 messages · Inbox/Suppliers
| From | Subject |
|---|---|
| Kestrelby Hardware | Invoice INV-20419, September delivery |
| Quorrel Timber Supply | Re: Revised quote for oak cladding |
| Halvard Glassworks | Delivery window for Bukit Timah site |
| Kestrelby Hardware | Statement of account, August |
Restore Download .eml
Backups
Keeping 7 daily and 12 monthly
| Completed | Status |
|---|---|
| 30 Sep, 02:04 | Success |
| 29 Sep, 02:03 | Locked |
| 28 Sep, 02:03 | Success |
| 01 Sep, 02:04 | Monthly |
| 01 Aug, 02:06 | Monthly |
Restore
Nothing is overwritten or deleted.
Start restore
Only with KumoBunker
Private mailboxes. Backed up, never readable.
Protect the mailboxes that matter most without anyone being able to read them: not your IT team, not your account admins, and not us.
Nobody can read it
Browsing, searching, opening and downloading its email are blocked for everyone, and every attempt is logged.
Fully restorable
Backed up every day with full history. If something goes wrong, the whole mailbox is restored back into itself.
The owner keeps their password
Send the mailbox owner a secure link to enter it themselves. You never need to know it.
Can't be quietly switched off
Once a mailbox is private, only our support team can change that, and the mailbox owner is told if they do.
A proper backup for the email you already have
No new email address, no software on your computer. Connect the mailbox you use today and KumoBunker takes it from there.
- Ransomware protection (add-on)A locked copy nobody can delete; restore from before an attack.
- Private mailboxesBack up sensitive mailboxes that nobody, not even we, can read.
- Works with almost any providercPanel, Plesk, DirectAdmin and other hosting panels, Zoho, Fastmail, Gmail, iCloud, Yahoo: anything with IMAP enabled.
- Daily or hourly, automaticallyAfter the first run, only new mail is downloaded.
- Search old mail in your browserRead any message or download the original file (not for private mailboxes).
- Restore one email or everythingInto the same mailbox, or a different one.
- Alerts that say what went wrongUsually a changed password. We tell you which mailbox and why.
- Access for your whole teamOwner, Member and Viewer roles with two-factor sign-in.
Works with the email you already have
- cPanel
- Plesk
- DirectAdmin
- CyberPanel
- ISPConfig
- Virtualmin
- Zoho Mail
- Fastmail
- Gmail
- iCloud Mail
- Yahoo Mail
- Your own mail server
Any mailbox with IMAP enabled. Microsoft 365 and Outlook.com aren't supported yet.
Go back to any day.
Every backup is kept as its own copy. If a folder was emptied on Wednesday, Tuesday's copy still has it all.
Daily and monthly history
Keep up to 7 daily copies and 24 monthly ones. Older copies clear out on their own.
Lock the ones that matter
Lock a backup to keep it, safe from clean-up and deletion, until you unlock it, for example the day before someone left.
See before you delete
When you remove old backups, the panel shows exactly how much space you'll get back.
Put it back where it was.
Restore a single email, a folder or a whole mailbox, with folders, dates and read status intact.
Kept apart by default
Restored mail goes into a "Recovered" folder, so it never gets mixed up with today's mail.
No duplicates
Messages already in the mailbox are skipped. Run the same restore twice and nothing doubles up.
Into any mailbox
Restore into a different account, even at a new provider. Handy when you're switching hosts.
Who it's for
The same product, set up a little differently depending on what you need it for.
Personal email
Years of receipts, letters and photos in a free or ISP mailbox that nobody backs up for you.
Read moreSmall businesses
Every staff and shared mailbox, including people who've left, without paying per user.
Read moreIT providers
Clients spread across different email hosts, with one way of backing up and restoring all of them.
Read moreRansomware protection · paid add-on
Hit by ransomware? Go back to the day before.
Ransomware and hijacked accounts can encrypt, delete or wreck the mail in your mailbox. With Immutable Backup & Recovery, a locked, off-site copy of your backups can't be changed or deleted by anyone, even if our own servers were attacked.
Locked for at least 30 days
Each day's copy is held in immutable storage. Until the lock ends, nobody can change or delete it: not an attacker, not a hijacked account, not us.
Off-site, with a different provider
Kept in a data centre in Why Europe? Privacy in Europe is governed by the General Data Protection Regulation (GDPR), widely considered the strongest and most comprehensive digital privacy law in the world., away from our backup servers and from your mail provider.
Restore the whole mailbox
Put every folder back as it was on the last clean day, into the same mailbox or a fresh one, without duplicates.
Encrypted before it leaves
The copy is encrypted on our servers first, so the storage provider can't read it. Private mailboxes stay private.
Stored safely, away from your provider
Your backups live on separate servers from your email, encrypted, with access you control.
Private when it matters
Mark a mailbox private and its email can never be read through KumoBunker, by your team or by ours. It is still backed up and fully restorable.
Encrypted per mailbox
Each mailbox's backups are encrypted with their own key, and connections to your mail server always use TLS.
Apart from your provider
Backups live on our own servers, separate from your mail provider, so a problem there never takes your backups with it.
Two-factor and a full log
Authenticator-app sign-in, and a record of every sign-in, restore, deletion and change.
Worth knowing: so you can read old mail in the browser, our service decrypts it when you ask (never for private mailboxes, which can't be read at all). KumoBunker is not end-to-end encrypted.
Choose your plan
Pay for storage, not for people. Every plan has every standard feature and unlimited mailboxes.
Example prices, not final yet
- Unlimited mailboxes and users
- Private mailboxes
- Restore from any earlier day
- Daily or hourly backups
- Browse, search and restore (private mailboxes: restore only)
- Encrypted storage
Try it on your own mailbox
Request a trial and we'll set up your account and email you a sign-in link.