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Audience: T1 / T2 Use when: You need to understand how NinjaOne Backup actually works before troubleshooting a failure — or when a tech asks "why isn't the backup running?" This page goes deeper than the setup SOP (page 1062). Understanding the architecture is...

Audience: T1 / T2 Use when: You've exhausted DTC-side troubleshooting and need to open a NinjaOne support ticket, or you're not sure whether an issue is DTC's to fix or NinjaOne's. DTC Scope vs. NinjaOne Scope Before escalating, make sure you're not calling N...

Audience: T2 Use when: NinjaOne console doesn't give you enough detail on a backup failure, or NinjaOne support asks for logs before they'll engage. Where Lockhart Logs Live The primary log directory on every backed-up Windows device: C:\ProgramData\NinjaRMM\...

Audience: T1 / T2 Use when: A backup fails with a numeric error code and you need to identify what it means and where to go next. All error codes link to their detailed page where available. Use Ctrl+F to jump to a specific code. General Errors (File/Folder a...

Audience: T1 / T2 Use when: You need to confirm a site's backup health at a glance, review what ran overnight, or generate documentation for a client or internal audit. Viewing Backup Status in the NinjaOne Console Organization-level overview: NinjaOne → sel...

Audience: T2 Use when: Lockhart fails to install on a device, or the backup agent isn't appearing after you've deployed it. Why Lockhart Installation Fails The two most common causes at DTC sites: TLS 1.2 is not the default protocol — NinjaOne Backup require...

Audience: T1 / T2 Use when: Backups aren't running and you suspect the Lockhart service is stopped, crashed, or misconfigured. Lockhart is the codename for the NinjaOne Backup agent service. It is completely separate from the main NinjaRMMAgent service. A devi...

Audience: T2 Use when: Lockhart.exe is consuming abnormal CPU or disk I/O — slowing the server or workstation while backups run, or causing disk queue issues overnight. Normal vs. Abnormal Lockhart Resource Usage Normal: Lockhart uses elevated disk I/O durin...

Audience: T1 / T2 Use when: You've assigned a backup plan to a device in NinjaOne but the Backup tab isn't showing, no jobs are running, or the device doesn't appear in the org's Backup Overview. Common Causes Symptom Most Likely Cause Device not in Ba...

Audience: T2 Use when: Backup fails with "VSS Error (132)..." or any error message referencing Volume Shadow Copy Service. VSS errors are Windows OS errors — not NinjaOne errors. NinjaOne cannot take a backup of open files without a successful VSS snapshot. Th...

Audience: T2 Use when: VSS writers won't recover after a reboot, or the specific VSS error code points to DLL registration as the cause (0x80042302, 0x80042301, 0x80042313). When to Use This Procedure DLL re-registration is a deeper fix — use it when: VSS wr...

Audience: T1 / T2 Use when: Backup fails with "Error 307: Volume has less than 20% disk space available — may be insufficient to complete a VSS snapshot." This is a warning that can escalate into a hard VSS failure (Error 132) if not addressed. The source volu...

Audience: T2 Use when: Image backup fails with "Error 327" referencing a VSS writer failure during snapshot preparation. Error 327 is more specific than Error 132 — it means a particular VSS writer explicitly reported an error during the pre-snapshot phase of ...

Audience: T1 / T2 Use when: Backup fails with "Error 121" — Windows system error ERROR_SEM_TIMEOUT (0x80070079) — "The semaphore timeout period has expired." This is a Windows OS-level timeout. Windows initiated an I/O operation against a disk or network share...

Audience: T1 / T2 Use when: Backup pre-flight fails with "Error 303: NAS path not set up on the device." What This Error Means The backup plan is set to Hybrid (local + cloud), but no local NAS storage location has been configured at the organization, locatio...

Audience: T1 / T2 Use when: Backup pre-flight fails with "Error 305: UNABLE_TO_ACCESS_LOCAL_STORAGE," or a backup hangs / sits in-progress and never completes (see symptom note below). What This Error Means NinjaOne can see the storage location is configured (...

Audience: T2 Use when: Image backup fails with "Error 306: Snapshot deleted while uploading." What This Error Means Lockhart successfully created a VSS snapshot and began uploading data, but the VSS snapshot was deleted (or expired) before the upload complete...

Audience: T2 Use when: Backup fails with "Error 308: Unable to determine free space." What This Error Means Lockhart is trying to determine available disk space before starting the backup (a standard pre-flight check), but the WMI (Windows Management Instrume...