Hi JuanjoSC,
unfortunately you didn't really read the KB - article. You would have noticed, that a restore process as well validates backups and its dumps. I didn't choose the suggested KB - article because of the title, but because of the suggestions, how to validate backups and its dumps.
Can it be that being in ftp, has tried to restore before copying locally?
This depends on your backup settings. If you choosed "compression", then the backup will be stored as "*.tgz" on your FTP, which is not a valid backup - file. I always recommend "no compression", because you avoid issue/errors, caused by the compression process, which is harder to investigate.
Another reason can be FTP - connection issues. The upload from the FTP - server hasn't been completely finished, but the verfify - process and a signature check has already been started. The options "
Upload backup files without a valid signature" and "
I want to restore this backup despite the fact that it does not have a valid signature" can avoid again some errors/issues.
To investigate issues/errors, you shouldn't guess things ( that's only time-investing and may not be related to facts ), but rather investigate them with the help of logs. It helps as well to use another log - level ( debug mode ), so your log will contain a more verbose output of the processes. It's as well a very good idea to try things more than once, before investigating issues/errors - often enough its just a temporary issue, or a non-reproducable failure.