Error="null" (temporary directory specified for the backup set is not writable)

ServosityStandard: 5.5.1.4
ServosityPro: 5.5.1.4
OS: All platforms

When performing a file backup that requires delta generation, the following error messages are received in the backup report:

Backup Logs  No.  Type  Timestamp  Backup Logs 1 Info YYYY/MM/DD hh:mm Start [ All platforms (Test), ServosityPro 5.5.1.4 ] 2 Info YYYY/MM/DD hh:mm Start running pre-commands 3 ... ... ... *  Error  YYYY/MM/DD hh:mm [Error] File="\Directory\File" Error="null"

The message suggests that the temporary directory specified for the affected backup set is set to a directory that is not writable (e.g. directory that does not exist).

This will usually occur in the cases where the "Temporary directory for storing backup files" setting has been specified to a mapped drive. However, the mapped drive is disconnected afterward.

Example in ServosityPro:

To resolve the issue, please ensure that the temporary directory specified for the affected backup set is writable.