-w, --raw
For encrypted datasets, send data exactly as it exists on disk.
This allows backups to be taken even if encryption keys are not
currently loaded. The backup may then be received on an untrusted
machine since that machine will not have the encryption keys to
read the protected data or alter it without being detected. Upon
being received, the dataset will have the same encryption keys as
it did on the send side, although the keylocation property will be
defaulted to prompt if not otherwise provided. For unencrypted
datasets, this flag will be equivalent to -Lec. Note that if you
do not use this flag for sending encrypted datasets, data will be
sent unencrypted and may be re-encrypted with a different
encryption key on the receiving system, which will disable the
ability to do a raw send to that system for incrementals.