Changes compared to 26.4.0
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
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.
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.
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.
Comet now features a Czech (Čeština) language translation, contributed by the community through the open-source translations repository on GitHub.
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 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.
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.
/run and /var/run excluded from Unix Files and Folders backups by defaultChanges compared to 26.2.3
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.
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.
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.
Customers running Ubuntu 25 can now take full disk image backups, keeping pace with the latest release cycle.
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.
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 defaultFiles 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.
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
Changes compared to 26.1.1
Comet now detects users inadvertently entering the Proxmox Web UI port number (8006) for the Proxmox SSH port in the Proxmox PI.
Changes compared to 26.2.1
Changes compared to 26.2.0
Changes compared to 26.1.0
Comet Admins can now set per-user quotas that limit how many Proxmox VMs and LXC containers a Comet User may protect. Quotas are enforced via the UI and API and will block and log attempts that would exceed the configured limit.
Proxmox 9.1 introduced/store tpmstate disks (TPM-saved state) as qcow2 images and changed how TPM-backed guests are represented.
Comet now supports Proxmox 9.1. Tpmstate disks stored as qcow2 can be backed up and restored, and tpmstate backups are more reliable.
Changes compared to 26.1.1