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Jim, at the moment you need the backup, the firewall is probably down. So you need to have it fixed as soon as possible, may be a large office can not work! That is the wrong moment to detect, your backup is failing, and you have to repair it somehow!!!

So IMHO you should know the back-up is not ok as soon as it is generated !!!

Your logic is flawed because if it could detect the backup was bad it could just not make a bad backup. If it generates a bad backup it's most likely from a bug, which isn't something the user could fix. And if it prevents you from making a backup in that situation then you would have no way to fix it.

If you do not regularly test your backups, that is your own procedural problem, not a problem the firewall can solve.

Jim, if the software which checks the backup-file when loaded can check if backup is OK, the same software could do that right after generation of the backup as well.

That is true but is also a non-statement. I already explained why that is irrelevant.

Looks like your actual problem (based on your forum thread) is this: #11050

Under normal conditions on a release, that is unlikely to happen. During development, bugs are more common. Users should not be using development versions in production, so there are no concerns about having to worry about uptime in production environments. (And if it is that mission critical, they should be using HA and thus it is still not a major concern).