As long as backups are running, logs are about as popular as a dashcam: you see them, you know they’re there—and you hope you’ll never really need them. But the moment a job fails, a service stops unexpectedly, or the software “just starts acting weird,” logs become the only reliable witness. They show what happened, when it happened, how other components reacted — and often why something was triggered in the first place.
In troubleshooting, a complete and properly retained log history often determines whether you can narrow down an outage or error within minutes— or whether you end up relying on assumptions, screenshots, and “it didn’t feel like it was like this before” statements. That’s why in this article we’ll look at:
- how to collect Veeam logs correctly (support-ready),
- which levers you have for retention and storage consumption (Windows registry keys, GUI settings, VEM, Best Practices),
- and how simple housekeeping can prevent a full log partition from slowing down operations .
Collecting Veeam Logs the Right Way (Support-Ready)
If you want to open a Veeam support case, complete logs are essential. You can find the official instructions on how to generate log bundles here:
- KB1832 – How to Collect Logs for Veeam Backup & Replication
https://www.veeam.com/kb1832
Log export via the GUI
In principle, it couldn’t be much easier:
- Open the Veeam Backup & Replication Console.
- From the main menu, go to Help → Support Information.
The wizard will guide you through the log export and lets you, among other things:
- export logs for a single job,
- export logs for specific objects/components (e.g., the Veeam Backup Server),
- optionally include the VBR database,
- and select the time range (number of days) for the logs to be exported.
Choose a time range that definitely includes the issue/error. Ideally, choose a window that contains both normal and abnormal behavior — this makes comparisons much easier.
If the GUI isn’t usable
If you can’t use the GUI, you can also copy the logs manually. KB1832 includes helpful notes like the log collection paths and alternative copy methods (e.g., PowerShell/Robocopy).
Where are the logs stored—and how large does the log partition need to be?
By default, Veeam stores log data under the (hidden) ProgramData path, typically at:C:\ProgramData\Veeam\Backup\
In larger environments, it is common to move logs to a separate partition and control retention/sizing. The officially documented settings for this can be found here:
- KB1825 – How to Change the Settings Related to Veeam Backup & Replication Log Files
https://www.veeam.com/kb1825
For planning, the Veeam Best Practice Guide is also helpful:
- VBR Best Practice – Backup Server
https://bp.veeam.com/vbr/3_Build_structures/B_Veeam_Components/B_VBR_Server/Backup_Server.html
There you’ll find guideline you can use as rules of thumb (e.g., size estimates based on the number of protected instances). In practice, dedicated log partitions of 100–200 GB are not uncommon in larger environments—depending on job count, change rate, error frequency, upgrade history, and overall log volume.
Important: Monitor both C: and any separate log partition actively, because “running full” has very unpleasant consequences.
What happens when the log partition is 100% full?
Scenario A: C: drive runs full
When C: fills up, Windows can no longer write reliably (temp files, updates, event logs, application data). This can severely impact the system—up to the point where it feels practically unusable:
- services no longer start cleanly,
- UI/management tools hang,
- updates/installers fail,
- components become unstable.
In short: a full C: drive isn’t just a Veeam problem—the entire system is affected.
Scenario B: a separate log partition runs full
When a dedicated log partition fills up, the operating system is usually still reachable and functional. However, components that need to write to that partition will hit write errors and may fail. This can lead to:
- Veeam components no longer operating reliably,
- Veeam jobs aborting while they were running,
- relevant Veeam services stopping/crashing.
So the OS remains “available”—but backups and restores are no longer possible, jobs have been aborted and won’t restart, and cleanup tasks may not complete properly (transfer logs, repository maintenance, etc.) until space is freed and affected services and jobs are restarted.
Windows VBR: Log optimization via registry keys — and their limits
For Windows-based VBR installations, there are registry keys that allow you to set and change the logging behavior of various Veeam components. This is explained in detail in KB1825.
- KB1825 – How to Change the Settings Related to Veeam Backup & Replication Log Files
https://www.veeam.com/kb1825
The following configuration options are available:
- Veeam Backup Server
- log path
- maximum log size
- retention period
- size/archiving behavior
- archive retention
- Veeam Enterprise Manager (VEM)
- log path
- maximum log size
- retention period
- Windows-Komponenten (e.g. Proxy-, Mount-, Gateway-Server, Repositories, WAN Accelerator, Tape Server)
- log path
- maximum log size
- retention period
- Linux-Komponenten (e.g. Proxy-, Mount-, Gateway-Server, Repositories, Tape Server)
- maximum log size
- retention period
(There are no “registry keys” on Linux, of course—the KB describes the appropriate mechanisms per OS.)
Important: What does this apply to—and what explicitly not?
As helpful as these settings are, they don’t automatically apply to “everything that happens to write logs.”
Examples of real-world limits/special cases:
- For plugins or special components, there may be no corresponding options (e.g.,
Svc.VssHwSnapshotProviderService.log,ExplorerStandByService). - Some log artifacts may still end up on C: (depending on component/plugin/implementation).
- Logs/histories can accumulate—for example after major upgrades, or due to leftovers that aren’t cleaned up automatically.
- Job-related logs can remain if a job has been deleted.
Special cases in the GUI: Audit Logs and Session History
Some log/history areas are not controlled via the registry, but directly in the GUI.
5.1 Audit Logs (path & compression)
Audit logs are configured under General Settings in VBR. They include all activities a user performs in a file-level restore context—across backups, replicas, and unstructured data backups.
Audit Logs Location (VBR User Guide)
https://helpcenter.veeam.com/docs/vbr/userguide/audit_logs_location.html?ver=13
5.2 Session History (History Retention)
You also control the retention of historical job/session information in the GUI:
- History Settings (VBR User Guide)
https://helpcenter.veeam.com/docs/vbr/userguide/history_settings.html?ver=13
The default value here is 13 weeks and can be adjusted to match your requirements.
5.3 Important: If you use Enterprise Manager
If Veeam Enterprise Manager is used in your environment, its retention configuration for the Job History settings overrides the value configured in VBR.
- Configuring retention settings (Enterprise Manager)
https://helpcenter.veeam.com/docs/vbr/em/configuring_retention_settings.html?ver=13
Housekeeping: additional cleanup via script (as a safety net)
Even if you’ve configured retention and paths correctly, additional housekeeping is still a good idea. Over time, files can accumulate that aren’t cleaned up automatically to the extent you expect—for example:
- certain leftover logs after major release upgrades,
- job-related logs, where the job has been removed,
- temporary files, dumps, archives.
You can find community examples online—for instance, the user DRRAGHAVENDRA99 has shared a good and simple PowerShell script:
https://drraghavendra99.medium.com/veeam-script-library-house-keeping-rules-f8603a89ded8
# Remove logs and temporary files older than a certain period
$LogRetentionDays = 30
# Specify the log and temporary file paths
$LogPath = "E:VeeamLogs"
$TempPath = "E:VeeamTemp"
# Remove old log files
Get-ChildItem -Path $LogPath -File | Where-Object { $_.CreationTime -lt (Get-Date).AddDays(-$LogRetentionDays) } | Remove-Item -Force
# Remove old temporary files
Get-ChildItem -Path $TempPath -File | Where-Object { $_.CreationTime -lt (Get-Date).AddDays(-$LogRetentionDays) } | Remove-Item -Force
Improvement potential (recommended)
If you use something like this in production, you may want to adjust the following points:
- Use LastWriteTime instead of CreationTime (logs are often appended over a long period before they are closed. So LastWriteTime is more relevant).
- Restrict deletions to specific file types (e.g.,
*.log,*.zip,*.dmp) to avoid deleting anything unintended. - Optionally run recursively (subfolders) and—if possible—with a dry run/WhatIf first, so you can see what would be deleted.
How is this currently handled in the Veeam Software Appliance (VSA)?
If you take a look at the Veeam Software Appliance (VSA), you’ll notice that it has a dedicated log area:/var/log/VeeamBackup/
There are also mechanisms in place to prevent this area from “overfilling.” Starting with version 13.0.1.1071 (Jan 6, 2026), a cron job was implemented that deletes old log files once the fill level reaches 90%. See the KB article:
KB4738 – Veeam Software Appliances Live Updates
https://www.veeam.com/kb4738
Conclusion & Future
A solid logging strategy is a combination of:
- proper log collection (KB1832),
- clean control of paths/retention (KB1825 + GUI settings),
- mindful handling of special cases (Audit Logs, History, VEM overrides),
- and regular housekeeping—so log growth doesn’t surprise you at the worst possible moment.
And because software is constantly evolving, it’s worth reviewing KBs and release/live update notes regularly—especially around log retention, archiving, and automatic cleanup. How log settings in Windows VBR and VSA will evolve in the future remains an interesting topic.
