When a job runs in unattended mode, there can be some conditions which have to be confirmed when the profile is configured. For example, file deletions have to be confirmed specially, in addition to configuring the sync operating mode to include deletions.
To give the confirmations, please edit your profile in Advanced Mode, go to the Safety section at the bottom and choose the tab sheet “Unattended Mode”.
For an Exact Mirror profile, you would usually make sure that the top four checkmarks are chosen and that the last one is not chosen (Special Safety Checks). The first four checkmarks allow things like replacing files and deleting files. The last checkmark would impose additional safety checks which can prevent file deletions, so you’ll want to remove that checkmark.
In addition, you should specify a percentage of files which may be deleted during a profile run. You should not set this to 100% unless you expect that nearly all files are regularly going to be deleted. This is a safety percentage. If more files than allowed need to be deleted, the program realizes that something is wrong and disables the deletions completely. This will protect you against rare error conditions like disk errors or network communication errors, which can sometimes cause empty folders to be reported on the source side. Due to the percentage limit, the program will not delete everything from the destination if suddenly the source seems to be empty, or nearly empty.
However, even if you do specify 100% for deletions, the program will never delete all files in order to protect your data. If the source side is empty, it will throw an error and refuse to delete everything from the destination. This should be a good safety measure for most use cases. Some customers, on the other hand, have use cases where deleting all files is a regular, normal requirement. These customers can disable the 100% deletion protection by adding the following line to the [Main] section of the INI file:
UnattendedDeleteAllIsOK_IfDelPercIs100=YES
(Add this only if you need to delete 100% of files in a destination folder in unattended mode!)