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
/runand/var/runexcluded from Unix Files and Folders backups by default- Improved error messaging for Backblaze Storage Vault creation failures
Bug Fixes
- Fixed an issue with Comet Management Console recent activity page not showing deleted Protected Items
- Fixed an issue with excessive CRC error logs in case of reading from bad disk
- Fixed an issue with checkpoint deletion created by the backup process but exited due to a crash or unclean termination
- Fixed Storage Vault ModifyTime not being updated when edited in the Comet Management Console
- Fixed an issue when requesting an Impossible Cloud (Partner API) Storage Vault where the request body was empty
- Fixed an issue when requesting an Impossible Cloud (Partner API) (Object Lock) Storage Vault where object lock days defaulted to 0
- Fixed an issue on the Comet Management Console where the test connection button would fail for Impossible Cloud (Partner API)
- Hid empty menu items on the Comet Management Console restore dialog snapshot selector
- Fixed an issue on Proxmox 9 where backups of VMs with virtio disks could fail with a disk open error
- Fixed an issue with the Getting Started guide being pushed off screen on smaller displays
- Fixed an issue where admin/create-install-token does not return an install token
- Fixed an issue with testing connection for a Storage Vault missing a scrollbar when there are more than 10 live connected devices
- Fixed a cosmetic issue with missing eye toggles in password fields in the Comet Management Console web interface
Changes compared to 26.2.4
- None