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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...

Audience: T2 Use when: Image backup fails with "Error 310: Unable to back up volume." What This Error Means Lockhart attempted to back up a specific volume (disk partition) and failed at the volume level — not at the VSS, NAS, or cloud level. The failure is s...

Audience: T2 Use when: Backup fails with "Error 311: INTEGRITY_CHECK_TOO_MANY_ERRORS_FAILED." What This Error Means NinjaOne performs periodic integrity checks on the backup repository stored on the NAS. Error 311 means the integrity check found too many inco...

Audience: T1 / T2 Use when: Backup fails with "Error 312: Existing NinjaOne Backup repository root folder location missing." What This Error Means The backups/ninjaone root folder that NinjaOne previously wrote backup data to no longer exists on the NAS. The ...

Audience: T1 / T2 Use when: Backup fails with "Error 344: Network Storage Low Space" (warning) — distinct from Error 345 (critical). Error 344 vs. Error 345 Code Threshold Backup Impact 344 NAS storage is low — approaching full Warning only — backup ma...

Audience: T2 Use when: Backup fails with "Error 342: NAS Write Error." What This Error Means Lockhart connected to the NAS, authenticated successfully, and attempted to write backup data — but the NAS rejected the write or the write failed mid-operation. The ...

Audience: T2 Use when: Backup fails with "Error 150: Database Error." What This Error Means Lockhart maintains an internal SQLite database that tracks backup metadata — revision history, block checksums, file indexes, and job state. Error 150 means this inter...