xp_cmdshell is one way, although it is not ideal, since it makes the server less secure.
, SQL Server, , :
msbp.exe backup "db(database=model)" "zip64" "local(path=\\server\share\path\model.full.bak.zip)"
SQL Server - "xcopy" - /, , .
zip64, zip 4 . : gzip bzip2, .