CobianSoft

I'm very intereted in reproducing this error somehow.

No, that shouldn't have happened.

You may be having "Absolute paths" enabled OR several sources with different roots in the same task.

Not in this version unfortunately

Almost any big mail provider is migrating to Aouth2, so this is indeed a problem sometimes.

The forum has its quirks.
I am thinking about replacing it with Discourse.

From the help file: Incremental - The program will check if the source has been changed from the last backup. If there is no need to copy the file, it will be skipped, saving backup time. The incremental procedure checks the Archive bit attribute of the file. You may want to manually reset the attri...

Hello

Just copy the underfolders Settings, Lists and Db from the installation folder (often C:\Program Files\Cobian Reflector ) to a safe place.

Take care

There is not such a thing. You can limit the number of differential backups but not incremental.