3. "All modules are saved in scheduled backups".
I believe that a home made module needs to implement the backup/restore code in order to be saved. (for the" little story" I am trying to make a new module, and I am not sure if I will implement the backup/restore stuff maybe it's a bad idea ?)
5. "Although courses backup/restore is the way to move courses between servers"
This was not clear for me and I thought (I am leasy) it could be a more or less a "full backup".