Index.db is in use

Error

The error index.db is in use is constantly shown at the start of the backup.
The backup always fails.

Cause

The file index.db is locked by the OS. Our software uses this file to index the data in the backup set.
We usually see this error when a backup terminates unexpectedly. The causes can be a user cancelling a backup, a system going offline (being switched off without warning), VSS failing on Windows systems, the backup quota being exceeded, or the system being backed up and running out of disk space.

Non-Windows systems which don’t use VSS will often keep a file locked and not release it.

Fixes (try each in turn if the previous fix doesn’t work).

  1. Log the Windows user off and on again. Retry the backup.

  2. Resolve local environmental issues such as low disk space or RAM. Retry the backup.

  3. Delete the temp folder containing the index file. The locations for Windows and macOS are shown below. Retry the backup.

Windows
c:\users\username\temp\backupset-id\destination-name\index\index.db

macOS
/Users/username/temp/backupset-id/destination-name/index/index.db