Per the 4D v11 SQL Language reference, error code 1409 is an error during backup that generally occurs from a read error for files to be backed up or a write error during file backup.
Here are 3 possible causes of this error, and the steps for how to resolve them.
- Disk permissions:
In order to perform the backup, you must have read permissions on all the files that are going to be backed up, and read-write permissions on the folder that the backup will be written to.
- Not enough disk space:
Make sure there is enough space to perform the backup.
- Error with the Backup.xml Preferences file:
Simply delete the Backup.xml file and then re-set the backup preferences.