A.4.3 I get ``No valid KBackup header''

If KBACKUP cannot find a valid header on your backup medium, although you have written an archive to it using KBACKUP , than there are two possible reason for this:

1. you are using a tape device that rewinds after closing a file. KBACKUP requires you to specify a device that does not rewind on close. These devices often carry an ``n'' in their name. If you try using a device with rewind-on-close feature, KBACKUP will overwrite its header with the directory and afterwards overwrite the directory with the actual archive, instead of writing the files one after another.
2. You might not have started your backup at the beginning of the tape. The automatic verify after a doing a backup will rewind the tape before verifying the backup, it will not automatically rewind the tape before writing the backup (for reasons of security). So try to manually rewind the tape before writing the backup.

In version $1.2.3$, I have introduced an option to check a tape device for compatibility with KBACKUP and also autodetect the proper device file.