Backup: ZIP File Structure Invalid

When backing up the Route Manager software, an error or popup appears that states "ZIP File Structure Invalid".

I get the message “zip file structure invalid” when attempting to do a RM backup

The message is a warning that you have more than 5 backups on your backup drive and Windows is not able to overwrite one of them to create room for the new backup file.

Try switching to a different backup drive, or moving some of your backups to a different folder. You could also rename one or more of the backups to something different.