Changes compared to 26.4.3

Enhancements​

• Added a job filter and a button to show deleted Protected Items on the Recent Activity page of the Comet Management Console (COMET-59549)
• Added an item count display for running backup jobs in the Comet Management Console, giving users another way to monitor job progress (COMET-59546)
• Backup job warning and error log messages are now aggregated, removing the previous log message cap (COMET-59547)
• Added a log message indicating when Files and Folders backup diagnostic logging is active (COMET-59545)

Bug Fixes​

• Fixed an issue with invalid paths in Comet Server Storage Role (COMET-59556)
• Fixed an issue with "relative path config not allowed" errors when using FTP Storage Vaults with "Store in default home directory" enabled (COMET-59732)

Changes compared to 26.5.0

Enhancements​

Faster Comet Server web interface load times (COMET-1680)​

The Comet Management Console now loads quicker on initial startup, reducing the time admins and users spend waiting to access the web interface.

Additional Impossible Cloud regions available as Storage Vaults (COMET-59652)​

Comet now supports the eu-west-3 and us-east-1 regions when configuring an Impossible Cloud Storage Vault, giving admins additional options for data residency and lower-latency backups in those geographies.

Changes compared to 26.4.0

Enhancements​

Log message aggregation for backup jobs​

In Comet 26.5.0, the previous hard cap of 15,000 log messages per backup job has been replaced with an aggregation approach. Up to 1,000 instances of the same warning message are recorded verbatim; after that, a summary entry is appended for every further 1,000 occurrences of the same message. This ensures that new issues are always visible in the job log and makes it easier to confirm that a job is still actively running.

Diagnostic logging status indicator for Files and Folders backups​

When Files and Folders diagnostic logging is active, Comet now logs a message at the start of the job to indicate that diagnostic logging is enabled. This is useful when reviewing logs with support and serves as a reminder to disable diagnostic logging when it is no longer needed.

Live item count updates for running backups​

The Comet Management Console now shows a live updating item count while a backup job is running, matching the existing behaviour in the Comet Backup desktop app. This gives users an additional way to confirm that a job is making progress when it might otherwise appear to have stalled.

2FA status visible in User list​

Admins can now view each user's two-factor authentication (2FA) status directly from the Users list in the Comet Management Console, without needing to open each user's detail page.

Improved offline license quota visibility​

The Comet Management Console now displays a warning banner when the offline license quota is exceeded. The offline server license information widget has been moved to the home page, and the quota exceeded warning message has been improved for clarity.

Linux Sandboxing always enabled for home directory restores​

Linux Sandboxing is now permanently enabled for Files and Folders restores to home directories, improving security by isolating file write operations from the broader system.

Improved Missed Backup log details​

Missed Backup log entries now include additional context about whether the target device was online at the time the backup was expected to run, making it easier to diagnose why a scheduled backup was missed.

Linux Files and Folders restore sandbox performance improvements​

Multiple performance optimisations have been applied to the Linux Files and Folders restore sandbox: the sandbox is now bypassed for non-home paths, a Trie data structure is used for fast path matching, LChown and Chmod operations are combined to reduce worker channel round trips, and worker/UID affinity scheduling has been introduced.

Improved Office 365 backup memory efficiency​

Office 365 calendar and mail backups now stream events and messages as they are processed rather than collecting them all in memory before starting. This reduces peak memory usage during backups of large mailboxes.

Policy default schedules applied to policy default Protected Items​

Policy default schedules are now automatically applied to policy default Protected Items that have no schedules of their own configured. For enforced Protected Items, schedules are always applied; for unenforced Protected Items, schedules are applied at Protected Item creation time. Default schedules are shown in a greyed-out, non-interactive state to distinguish them from explicitly configured schedules.

Changes compared to 26.4.2

Bug Fixes​

• Fixed an issue with invalid PKCS11 paths (COMET-59710)

Changes compared to 26.4.1

Bug Fixes​

• Fixed an issue where existing Storage Templates configured under tenant organizations failed to create new Storage Vaults after upgrading (COMET-59657)
• Fixed an issue with Office 365 where a file shrink might cause a SharePoint/OneDrive backup of an account to skip (COMET-59473)
• Fixed an issue with invalid paths in Comet Server Storage Role (COMET-59556)
• Fixed an issue with Comet backup-tool env var injection in the elevator's run-command-elevated endpoint (COMET-59553)
• Fixed an issue on the Comet Management Console Recent Activity page where ghost unknown entries would be shown (COMET-59549)

Changes compared to 26.4.0

Bug Fixes​

• Fixed an issue with admin account authentication in the Comet Management Console (COMET-59538)
• Fixed an issue with inaccurate audit log entries for admin logins in the Comet Management Console (COMET-59538)

Phoebe is the latest entry in our quarterly rollup series. It branches off from our main rolling Voyager development into a fixed target for our partners to qualify and build upon.

This Quarterly release is named after Saturn's moon Phoebe. Fun fact: Phoebe is one of Saturn's most unusual moons — it orbits in the opposite direction (retrograde) to nearly all of Saturn's other moons, which strongly suggests it was captured from the Kuiper Belt rather than forming alongside Saturn. Its surface is exceptionally dark, reflecting only about 6% of the sunlight that hits it, making it one of the darkest objects in the Solar System. NASA's Cassini spacecraft flew by Phoebe in 2004, revealing a heavily cratered, ancient world rich in ice and carbon — a relic from the earliest days of our solar system.

Comet 26.4.0 Phoebe brings new features that expand how you can access and manage Comet Backup. Highlights include Proxmox guest quotas for better resource control and Storage Template replication across management consoles for simplified multi-server environments. This release also adds Czech language support, updates to our Ukrainian translation, and an important fix for a Microsoft 365 Graph API issue that affected backup providers industry-wide.

As always for a new quarterly release, there are two changelogs for 26.4.0 depending on whether you are coming from the previous quarterly release or the previous Voyager release:

Changes compared to 26.1.3

Notice​

Gradient PSA integration retired​

The Gradient PSA integration has been retired. Existing configurations are preserved and clearly marked as deprecated in the UI, with a startup warning to help administrators plan any necessary migration.

New Features​

cPanel Plugin​

Comet Backup is now available as a native cPanel plugin, bringing enterprise-grade backup directly into the world's most popular hosting control panel. WHM administrators can set up, schedule, and manage per-account backups entirely within WHM — including activation, storage provisioning, backup scheduling, and per-account restores.

Microsoft 365 Graph API safeguard​

Added safeguards against an upstream Microsoft Graph API bug that caused Calendar Events delta queries to enter an infinite loop. Comet now detects when a delta query returns an abnormally large or unbounded dataset, terminates the runaway request, and falls back to a safe recovery path — allowing backup jobs to complete successfully without manual intervention.

New Czech language translation​

Comet now features a Czech (Čeština) language translation, contributed by the community through the open-source translations repository on GitHub.

Added Storage Template replication as part of the Management Console replication​

Storage Templates can now be replicated as part of the Management Console replication feature. Organizations running multiple management consoles will have their storage configurations stay consistent across all consoles automatically.

Proxmox VM and LXC template backup and restore​

Proxmox customers can now protect their VM and LXC templates — with full backup and restore support. This closes a meaningful gap in Proxmox coverage, ensuring the building blocks of an environment can be recovered just as reliably as live workloads.

Zero-touch device registration for 2FA-enabled users​

Administrators can now register devices on behalf of users who have 2FA enabled, using either lobby mode or an install token, without requiring the user to be present or share their TOTP code. This removes a key friction point in enterprise and MSP deployments, enabling true zero-touch device provisioning.

Enhancements​

• Added internal mongodump functionality and removed support for the use of an external mongodump executable
• Added automatic redirect to new job's report page when triggered through the web UI
• Include --skip-dump-date flag when calling external mysqldump agent for MySQL backups to reduce unneeded data
• Added custom general-purpose metadata fields to the User Profile for use via the Comet Management Console API
• Added a lock/unlock button to password and bucket ID fields to prevent password manager autofill
• Disk image backup support for Ubuntu 25
• Auto-add Cluster Manager target when creating Storage Templates
• Streamlined licensing during Comet Core installation
• /run and /var/run excluded from Unix Files and Folders backups by default
• Improved error messaging for Backblaze Storage Vault creation failures

Changes compared to 26.2.3

Notice​

Gradient PSA integration retired​

The Gradient PSA integration has been retired. Existing configurations are preserved and clearly marked as deprecated in the UI, with a startup warning to help administrators plan any necessary migration.

New Features​

Proxmox VM and LXC template backup and restore​

Proxmox customers can now protect their VM and LXC templates — with full backup and restore support. This closes a meaningful gap in Proxmox coverage, ensuring the building blocks of an environment can be recovered just as reliably as live workloads.

Zero-touch device registration for 2FA-enabled users​

Administrators can now register devices on behalf of users who have 2FA enabled, using either lobby mode or an install token, without requiring the user to be present or share their TOTP code. This removes a key friction point in enterprise and MSP deployments, enabling true zero-touch device provisioning.

Enhancements​

Disk image backup support for Ubuntu 25​

Customers running Ubuntu 25 can now take full disk image backups, keeping pace with the latest release cycle.

Auto-add Cluster Manager target when creating Storage Templates​

When setting up a Storage Template or replication target, administrators are now prompted to simultaneously register the destination as a Cluster Manager target — eliminating a common multi-step setup gap.

Streamlined licensing during Comet Core installation​

The Comet Core installer now presents a streamlined licensing experience showing only the serial license key option.

/run and /var/run excluded from Unix Files and Folders backups by default​

Files and Folders backups on Unix systems now automatically exclude /run and /var/run by default. Excluding these paths out-of-the-box improves efficiency and reduces unnecessary data capture without any user configuration.

Improved error messaging for Backblaze Storage Vault creation failures​

When a Backblaze-backed Storage Vault fails to be created, users now receive a clear, actionable error message instead of a generic server error — reducing troubleshooting time and support overhead.

Changes compared to 26.1.2

Changes compared to 26.2.2

Enhancements​

• Update the Ukrainian language translation
• Perform automatic internet time sync in the Linux Recovery Media