Error thrown while taking backup of SQL Server content database using PowerShell -

i trying take backup of sql server content database using powershell.

here code:

$dt = get-date -format yyyymmddhhmmss $null =  [reflection.assembly]::loadwithpartialname("microsoft.sqlserver.smo");    $srvrvinstancename= "srvr-04\mssqlserver1"     $svr = new-object        microsoft.sqlserver.management.smo.server($srvrvinstancename);        #write-output $svr wss_content_2d426b353ded49aa8ace920d4178c298        $bdir = "c:"         $svnm = $svr.name        $db =         $svr.databases['wss_content_2d426b353ded49aa8ace920d4178c298']        $dbname = $db.name       $dt = get-date -format yyyymmddhhmmss         $bfil = "$bdir\$($dbname)_db_$($dt).bak"        backup-sqldatabase -serverinstance $svnm -database $dbname -        backupfile $bfil 

but when run code error:

backup-sqldatabase : 'backup-sqldatabase' command found in module 'sqlps', module not loaded. more information, run 'import-module sqlps'.
@ line:19 char:1
+ backup-sqldatabase -serverinstance $svnm -database $dbname -backupfile $bfil + ~~~~~~~~~~~~~~~~~~ + categoryinfo : objectnotfound: (backup-sqldatabase:string) [], commandnotfoundexception + fullyqualifiederrorid : couldnotautoloadmatchingmodule

after that, ran

import-module sqlps  

but ran error state:

import-module : file c:\program files (x86)\microsoft sql server\110\tools\powershell\modules\sqlps\sqlps.ps1 cannot loaded because running scripts disabled on system.
more information, see about_execution_policies @ http://go.microsoft.com/fwlink/?linkid=135170.
@ line:1 char:1
+ import-module sqlps
+ ~~~~~~~~~~~~~~~~~~~ + categoryinfo : securityerror: (:) [import-module], pssecurityexception + fullyqualifiederrorid : unauthorizedaccess,microsoft.powershell.commands.importmodulecommand

what doing wrong?

i think need load couple off assembly:

# load sql server assemblies # [system.reflection.assembly]::loadwithpartialname("microsoft.sqlserver.smo")         | out-null  # smoextended  # [system.reflection.assembly]::loadwithpartialname("microsoft.sqlserver.smoextended") | out-null [reflection.assembly]::loadwithpartialname("microsoft.sqlserver.connectioninfo")     | out-null [reflection.assembly]::loadwithpartialname("microsoft.sqlserver.smoenum")            | out-null 

update.

for scripts can't executed need (as administrator in powershell)

set-executionpolicy remotesigned