Powershell -- evaluation of double backslashes

$cp = "\\abcdfs1\$source   \\axyzfs1\$dest  /E /COPY:DAT  /Z /R:5 /W:5 /v /purge /log:$logname1"

I am feeding the above line to a robocopy command, robocopy $cp  

An echo of $cp prints as above, and expands the variables appropriately -- looks great.
When the command executes -  backslashes are stripped from the second segment, such that:
\\axyzfs1\$dest  becomes \axyzfs1\$dest  

I've tried multiple backslashes and still end up with '1'.  Of course, if I use single quotes, the variables don't expand.  I've finagled all my ideas, assistance is definitely required and appreciated.

In a nutshell, I need the "\\" and I have variables to expand.  I can only figure out how to do one or the other.

Thanks.
apsutechteamAsked:
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Joshua GrantomSenior Systems AdministratorCommented:
Your code should look more like this
$source = "\\abcdfs1\myfolder"
$dest = "\\axyzfs1\myfolder"
$logname1 = mylog.log

Invoke-Expression "robocopy $source $dest /E /COPY:DAT /Z /R:5 /W:5 /v /purge /log:$logname1"

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I would also edit your topics on the post to include Powershell. :)
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David Johnson, CD, MVPOwnerCommented:
$source = "abc"
$dest = "def"
$logname1 = "log.txt"
$cp = "\\axyzfs1\$source \\abcdfs1\$dest /E /COPY:DAT  /Z /R:5 /W:5 /v /purge /log:$logname1"
Start-Process robocopy.exe -ArgumentList $cp

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apsutechteamAuthor Commented:
Thanks to both of you -- both approaches seem to solve my issue.
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