Dear Michael,
only with the zipped file-storage it´s posssible to store multiple backups. This was the main reason for me to upgrade to premium. I´d rather fix the problem as to get my money back.
As seen above the serverbuddy test
Zip Methods exec (best) > ziparchive > pclzip (worst) exec, ziparchive, pclzip OK
shows, that zip archives shouldn´t be a problem with the server settings. Don´t you have any idea what could be the problem?
kindly
Achim