Well, all limitations of the archive tools used by KBACKUP
still apply. If e.g. afio(1) has a bug, KBACKUP will have it, too.
Another serious limitation occurs when using pgp(1) for encrypting archives. Pgp(1) creates temporary files during operation, so that, when using tar(1) the maximum size of the archive is somehow limited by your free disk space in the directory for storing temporary files. Better use afio(1)
for writing encrypted archives, not tar(1) .
This problem has led to some patches for afio(1) and I hope they will make it into the official release soon, so that KBACKUP will be able to provide secure encryption.