pgBackRest: inability to run concurrent backups on different repositories for the same stanza

pgBackRest: inability to run concurrent backups on different repositories for the same stanza: a task in LegoFlow-SWE (Harbor dataset). When a backup for a stanza is already running against one repository (e.g., repo1 ) and a second backup is started against a different repository (e.g., repo2 )…

The task

When a backup for a stanza is already running against one repository (e.g., `repo1`) and a second backup is started against a *different* repository (e.g., `repo2`) for the **same stanza**, the second backup fails immediately with:

Part of Lego-X/LegoFlow-SWE.