Hello all,



I am wanting to have a powershell script run each morning that will perform
back up of several directories, containing hundreds of files. The Copy-Item
cmd-let works great for copying the directories, but, I didn't see an
explicit option to set that will only back up the files that are different or
don't exist, thus giving me an incremental backup? The files are to large to
just do a force overwrite each time.

Before I delve into writing custom functions to perform this task, I was
wondering if there was an easy option or property I was missing that will do
this?

Thanks,
Flea#
--
http://fleasharp.blogspot.com/

Hi Flea,

> I am wanting to have a powershell script run each morning that will
> perform
> back up of several directories, containing hundreds of files. The
> Copy-Item
> cmd-let works great for copying the directories, but, I didn't see an
> explicit option to set that will only back up the files that are different
> or
> don't exist, thus giving me an incremental backup? The files are to large
> to
> just do a force overwrite each time.

This may be a "low-tech" way of doing it, but for this I just use my
powershell script to drive robocopy.exe, which can do that (and it's really
fast as well).


--
Tomas Restrepo
http://www.devdeo.com/
http://www.winterdom.com/weblog/

As far as I know there is no such an option in PowerShell. If you want to
write this function for fun, do it, indeed. But for serious tasks like this
I would rather recommend to use some existing tools with tons of options,
one of them Robocopy for example (which by default copies folders exactly as
you want).

--
Thanks,
Roman Kuzmin

http://code.google.com/p/farnet/
PowerShell and .NET in Far Manager

Roman, Tomas, thank you both!

-Flea

--
http://fleasharp.blogspot.com/


"Tomas Restrepo [MVP]" wrote:

> Hi Flea,
>

> > I am wanting to have a powershell script run each morning that will
> > perform
> > back up of several directories, containing hundreds of files. The
> > Copy-Item
> > cmd-let works great for copying the directories, but, I didn't see an
> > explicit option to set that will only back up the files that are different
> > or
> > don't exist, thus giving me an incremental backup? The files are to large
> > to
> > just do a force overwrite each time.

>
> This may be a "low-tech" way of doing it, but for this I just use my
> powershell script to drive robocopy.exe, which can do that (and it's really
> fast as well).
>
>
> --
> Tomas Restrepo
> http://www.devdeo.com/
> http://www.winterdom.com/weblog/
>
>

Look at the first post in this thread. This script may be what you are
looking for...
http://groups.google.com/group/micro...55886ab29290ae

HTH
Ozone

This script takes one or more source directories and one destination, e.g.

.\script dir1, e:\dir2, dir3 if:\backup

< script.ps1 >
param ([array]$source, $destination)
if (!$source -or !$destination) {throw 'Missing argument'}
if (!(test-path $destination -is)) {
throw "$destination << is not a valid path"
}

function Compare-Hash ($f1, $f2) {
$sha1 = [System.Security.Cryptography.SHA1]::create()
$stream1 = new-object IO.StreamReader $f1
$h1 = $sha1.computeHash($stream1.baseStream)
$stream1.close()
$stream2 = new-object IO.StreamReader $f2
$h2 = $sha1.computeHash($stream2.baseStream)
$stream2.close()
"$h1" -eq "$h2"
}

foreach ($src in $source) {
$srcDir = $(if (!(test-path $src)) {
throw "Verify ${src}'s path."} else {
(rvpa $src).path})

$dst = $destination + ($srcDir -replace '^.+(\\.+)$','$1')
$dstDir = $(if (!(test-path $dst)) {
(ni $dst -i d*).fullName} else {
(rvpa $dst).path})

$escSrcDir = [regex]::escape($srcDir)

$srcSub = ls $srcDir -r | ? {$_.psIsContainer} | % {$_.fullName} | sort
if ($srcSub) {
$srcSub -replace $escSrcDir, $dstDir |
% {if (!(test-path $_)) {[void](ni $_ -i d*)}}
}

$testSrc = ls $srcDir -r | ? {!$_.psIsContainer} |
% {$_.fullName -replace $escSrcDir} | sort

$testDst = ls $dstDir -r | ? {!$_.psIsContainer} |
% {$_.fullName -replace [regex]::escape($dstDir)} | sort

$testSrc | ? {$testDst -notContains $_} |
cpi -pat {$srcDir + $_} -des {$dstDir + $_}

$testDst | ? {$testSrc -contains $_ -and
!(compare-hash ($srcDir + $_) ($dstDir + $_))} |
cpi -pat {$srcDir + $_} -des {$dstDir + $_}
}
< end >

--
Kiron

I think WMI is the best way to go for this. I just wrote this but did not
test it. It could also use some more error checking. If I get the change
over the weekend I will test and improve it. If you make changes and
improve it, please post it for other to see and use.

$strSource = "c:\test"
$strTarget = "c:\ftp\test"

function CopyDir([string]$strSource, [string]$strTarget)
{

$strComputer = "."

$colFolder = Get-WmiObject -Class Win32_Directory -namespace
"root\CIMV2" -computername $strComputer | where{$_.name -eq $strSource}

foreach($objFolder in $colFolders)
{
[int]$errResults = $colFolders.CopyEx($strTarget)

switch($errResults)
{
0 {Write-Host "The request was successful."}
2 {Write-Host "Access was denied."}
8 {Write-Host "An unspecified failure occurred."}
9 {Write-Host "The name specified was invalid."}
10 {Write-Host "The object specified already exists."}
11 {Write-Host "The file system is not NTFS."}
12 {Write-Host "The platform is not Windows 2000 or Windows NT."}
13 {Write-Host "The drive is not the same."}
14 {Write-Host "The directory is not empty."}
15 {Write-Host "There has been a sharing violation."}
16 {Write-Host "The start file specified was invalid."}
17 {Write-Host "A privilege required for the operation is not held."}
21 {Write-Host "A parameter specified is invalid."}
}
}

}



"Flea#" <Flea@xxxxxx> wrote in message
news:7B82DEE2-26C3-46AB-9636-4F45655DE2F9@xxxxxx

> Hello all,
>
> I am wanting to have a powershell script run each morning that will
> perform
> back up of several directories, containing hundreds of files. The
> Copy-Item
> cmd-let works great for copying the directories, but, I didn't see an
> explicit option to set that will only back up the files that are different
> or
> don't exist, thus giving me an incremental backup? The files are to large
> to
> just do a force overwrite each time.
>
> Before I delve into writing custom functions to perform this task, I was
> wondering if there was an easy option or property I was missing that will
> do
> this?
>
> Thanks,
> Flea#
> --
> http://fleasharp.blogspot.com/