With backticked qoutation marks:

[DBG]: PS C:\workspace\kslog\Deploy> $arguments
-verb:sync
-source:contentPath=C:\workspace\kslog\build\deploy
-dest:contentPath=c:\temp\kslog,computerName=192.168.1.34,username=administrator,password=
-verbose
-postSyncOnSuccess:runCommand="powershell -Command c:\temp\kslog\remotetasks.ps1 Deploy"

[DBG]: PS C:\workspace\kslog\Deploy> echoargs $arguments
Arg 0 is <-verb:sync>
Arg 1 is <-source:contentPath=C:\workspace\kslog\build\deploy>
Arg 2 is <-dest:contentPath=c:\temp\kslog,computerName=192.168.1.34,username=administrator,password=>
Arg 3 is <-verbose>
Arg 4 is <-postSyncOnSuccess:runCommand=powershell>
Arg 5 is <-Command>
Arg 6 is <c:\temp\kslog\remotetasks.ps1>
Arg 7 is <Deploy>

Without backticks or qoutation marks:

[DBG]: PS C:\workspace\kslog\Deploy> $arguments
-verb:sync
-source:contentPath=C:\workspace\kslog\build\deploy
-dest:contentPath=c:\temp\kslog,computerName=192.168.1.34,username=administrator,password=
-verbose
-postSyncOnSuccess:runCommand=powershell -Command c:\temp\kslog\remotetasks.ps1 Deploy
[DBG]: PS C:\workspace\kslog\Deploy> echoargs $arguments
Arg 0 is <-verb:sync>
Arg 1 is <-source:contentPath=C:\workspace\kslog\build\deploy>
Arg 2 is <-dest:contentPath=c:\temp\kslog,computerName=192.168.1.34,username=administrator,password=>
Arg 3 is <-verbose>
Arg 4 is <-postSyncOnSuccess:runCommand=powershell -Command c:\temp\kslog\remotetasks.ps1 Deploy>