Problem Description
Backups on macOS devices were failing in Druva inSync, even though the devices were connecting regularly.
Cause
The root cause was identified as insufficient disk space on the affected macOS device. The inSync client was unable to initialize its required database file (inSyncP3Config.json) due to lack of available storage in the user’s home directory.
Traceback
[2026-03-26 06:35:12,725] [ERROR] Error in saving P3 JSON Config file. Fault [Errno 28] No space left on device: '/Users/mariah/Library/Application Support/inSync/inSyncP3Config.json.new' [2026-03-26 06:35:12,726] [ERROR] Error <class 'OSError'>:[Errno 28] No space left on device: '/Users/mariah/Library/Application Support/inSync/inSyncP3Config.json.new' Traceback -Traceback (most recent call last): File "inSyncLib/inSyncConfigParser.py", line 122, in saveP3Config File "inSyncClient/inSyncClientUtil.py", line 227, in saveP3ConfigLocked OSError: [Errno 28] No space left on device
Resolution
To resolve the issue, follow these steps:
Free Up Disk Space
Ensure there is enough free space on your macOS device. This allows inSync to create and maintain its configuration files.
Restart inSync
After freeing up space, restart the Druva inSync client.
Verify Permissions
Make sure Full Disk Access is allowed for the inSync application under macOS security settings.
Preventive Tip:
Maintain sufficient free disk space to avoid backup interruptions. Regularly monitor available space if your device handles large files.