Greetings,
Is there anyone that has tried to use powershell as a simple sync of data
for backup?
For example from PC to and external HDD



many thanks

This should be pretty simple. What is your goal?

Master/Slave?
Master/Master?
Conflict resolution?

"Cyber-Guy" <cyber-guy@xxxxxx> wrote in message
news:%23oC5sf%236HHA.4348@xxxxxx

> Greetings,
> Is there anyone that has tried to use powershell as a simple sync of data
> for backup?
> For example from PC to and external HDD
>
> many thanks
>

Brandon Shell wrote:

> This should be pretty simple. What is your goal?
>
> Master/Slave?
> Master/Master?
> Conflict resolution?

Yes, yes, and yes.

I just tried using foldershare.com the other day to sync my PS $profiledir and
some other things for work<->home syncing. And I've been using SyncToy from MS
for some local<->\\network syncing as well. Those work fine, but it's not
Powershell. And if it's not Powershell, it's CRAP! [read in a Scottish accent.]



--

Hal Rottenberg
blog: http://halr9000.com
powershell category:
http://halr9000.com/article/category...ng/powershell/

Hmmm... lemme see what I can put together.
Master/Slave is a no brainer
Master/Master we can use file Hash and date

"Hal Rottenberg" <hal@xxxxxx> wrote in message
news:%23eFlbN$6HHA.5184@xxxxxx

> Brandon Shell wrote:

>> This should be pretty simple. What is your goal?
>>
>> Master/Slave?
>> Master/Master?
>> Conflict resolution?

>
> Yes, yes, and yes.
>
> I just tried using foldershare.com the other day to sync my PS $profiledir
> and some other things for work<->home syncing. And I've been using
> SyncToy from MS for some local<->\\network syncing as well. Those work
> fine, but it's not Powershell. And if it's not Powershell, it's CRAP!
> [read in a Scottish accent.]
>
>
>
> --
>
> Hal Rottenberg
> blog: http://halr9000.com
> powershell category:
> http://halr9000.com/article/category...ng/powershell/

Any thoughts on the best way to compare the source and destination? Anyone?
I have a function to get a MD5 of the files, but I'm just wonder what others
think is a good idea for the compare.

"Brandon Shell" <tshell.mask@xxxxxx> wrote in message
news:OqxxF6$6HHA.536@xxxxxx

> Hmmm... lemme see what I can put together.
> Master/Slave is a no brainer
> Master/Master we can use file Hash and date
>
> "Hal Rottenberg" <hal@xxxxxx> wrote in message
> news:%23eFlbN$6HHA.5184@xxxxxx

>> Brandon Shell wrote:

>>> This should be pretty simple. What is your goal?
>>>
>>> Master/Slave?
>>> Master/Master?
>>> Conflict resolution?

>>
>> Yes, yes, and yes.
>>
>> I just tried using foldershare.com the other day to sync my PS
>> $profiledir and some other things for work<->home syncing. And I've been
>> using SyncToy from MS for some local<->\\network syncing as well. Those
>> work fine, but it's not Powershell. And if it's not Powershell, it's
>> CRAP! [read in a Scottish accent.]
>>
>>
>>
>> --
>>
>> Hal Rottenberg
>> blog: http://halr9000.com
>> powershell category:
>> http://halr9000.com/article/category...ng/powershell/

>

Here is what I got... recommendations for performance are welcome.

Basically it gets all the files/folders from both the Source and
Destination.
- If first checks for folders and creates them if they are missing.
- It Checks the files from the Source in the Destination
1) If they exists it copies which ever is newer.
2) If they are missing it copies them to Destination
- It Checks the files from the Destination in the Source
1) If they are missing it copies them to Destination

###################################################
###################################################
Param($Source,$Destination)
#$Source = "C:\temp\Source"
#$Destination = "C:\temp\Destination"
function Get-FileMD5 {
Param([string]$file)
$mode = [System.IO.FileMode]("open")
$access = [System.IO.FileAccess]("Read")
$md5 = New-Object System.Security.Cryptography.MD5CryptoServiceProvider
$fs = New-Object System.IO.FileStream($file,$mode,$access)
$Hash = $md5.ComputeHash($fs)
$fs.Close()
[string]$Hash = $Hash
Return $Hash
}
function Copy-LatestFile{
Param($File1,$File2,[switch]$whatif)
$File1Date = get-Item $File1 | foreach-Object{$_.LastWriteTimeUTC}
$File2Date = get-Item $File2 | foreach-Object{$_.LastWriteTimeUTC}
if($File1Date -gt $File2Date)
{
Write-Host "$File1 is Newer... Copying..."
if($whatif){Copy-Item -path $File1 -dest $File2 -force -whatif}
else{Copy-Item -path $File1 -dest $File2 -force}
}
else
{
Write-Host "$File2 is Newer... Copying..."
if($whatif){Copy-Item -path $File2 -dest $File1 -force -whatif}
else{Copy-Item -path $File2 -dest $File1 -force}
}
Write-Host
}

# Getting Files/Folders from Source and Destination
$SrcEntries = Get-ChildItem $Source -Recurse
$DesEntries = Get-ChildItem $Destination -Recurse

# Parsing the folders and Files from Collections
$Srcfolders = $SrcEntries | Where-Object{$_.PSIsContainer}
$SrcFiles = $SrcEntries | Where-Object{!$_.PSIsContainer}
$Desfolders = $DesEntries | Where-Object{$_.PSIsContainer}
$DesFiles = $DesEntries | Where-Object{!$_.PSIsContainer}

# Checking for Folders that are in Source, but not in Destination
foreach($folder in $Srcfolders)
{
$SrcFolderPath = $source -replace "\\","\\" -replace "\:","\:"
$DesFolder = $folder.Fullname -replace $SrcFolderPath,$Destination
if(!(test-path $DesFolder))
{
Write-Host "Folder $DesFolder Missing. Creating it!"
new-Item $DesFolder -type Directory | out-Null
}
}

# Checking for Folders that are in Destinatino, but not in Source
foreach($folder in $Desfolders)
{
$DesFilePath = $Destination -replace "\\","\\" -replace "\:","\:"
$SrcFolder = $folder.Fullname -replace $DesFilePath,$Source
if(!(test-path $SrcFolder))
{
Write-Host "Folder $SrcFolder Missing. Creating it!"
new-Item $SrcFolder -type Directory | out-Null
}
}

# Checking for Files that are in the Source, but not in Destination
foreach($entry in $SrcFiles)
{
$SrcFullname = $entry.fullname
$SrcName = $entry.Name
$SrcFilePath = $Source -replace "\\","\\" -replace "\:","\:"
$DesFile = $SrcFullname -replace $SrcFilePath,$Destination
if(test-Path $Desfile)
{
$SrcMD5 = Get-FileMD5 $SrcFullname
$DesMD5 = Get-FileMD5 $DesFile
If(Compare-Object $srcMD5 $desMD5)
{
Write-Host "The Files MD5's are Different... Checking Write
Dates"
Write-Host $SrcMD5
Write-Host $DesMD5
Copy-LatestFile $SrcFullname $DesFile
}
}
else
{
Write-Host "$Desfile Missing... Copying from $SrcFullname"
copy-Item -path $SrcFullName -dest $DesFile -force
}
}

# Checking for Files that are in the Destinatino, but not in Source
foreach($entry in $DesFiles)
{
$DesFullname = $entry.fullname
$DesName = $entry.Name
$DesFilePath = $Destination -replace "\\","\\" -replace "\:","\:"
$SrcFile = $DesFullname -replace $DesFilePath,$Source
if(!(test-Path $SrcFile))
{
Write-Host "$SrcFile Missing... Copying from $DesFullname"
copy-Item -path $DesFullname -dest $SrcFile -force
}
}



"Brandon Shell" <tshell.mask@xxxxxx> wrote in message
news:uC8XtFR7HHA.4880@xxxxxx

> Any thoughts on the best way to compare the source and destination?
> Anyone?
> I have a function to get a MD5 of the files, but I'm just wonder what
> others think is a good idea for the compare.
>
> "Brandon Shell" <tshell.mask@xxxxxx> wrote in message
> news:OqxxF6$6HHA.536@xxxxxx

>> Hmmm... lemme see what I can put together.
>> Master/Slave is a no brainer
>> Master/Master we can use file Hash and date
>>
>> "Hal Rottenberg" <hal@xxxxxx> wrote in message
>> news:%23eFlbN$6HHA.5184@xxxxxx

>>> Brandon Shell wrote:
>>>> This should be pretty simple. What is your goal?
>>>>
>>>> Master/Slave?
>>>> Master/Master?
>>>> Conflict resolution?
>>>
>>> Yes, yes, and yes.
>>>
>>> I just tried using foldershare.com the other day to sync my PS
>>> $profiledir and some other things for work<->home syncing. And I've
>>> been using SyncToy from MS for some local<->\\network syncing as well.
>>> Those work fine, but it's not Powershell. And if it's not Powershell,
>>> it's CRAP! [read in a Scottish accent.]
>>>
>>>
>>>
>>> --
>>>
>>> Hal Rottenberg
>>> blog: http://halr9000.com
>>> powershell category:
>>> http://halr9000.com/article/category...ng/powershell/

>>

>

"Brandon Shell"

> Any thoughts

> I have a function to get a MD5 of the files,

Habit #6: Don't Write Insecure Code
http://msdn.microsoft.com/msdnmag/is...cureHabits/#S6

Flowering Weeds wrote:

>> I have a function to get a MD5 of the files,

>
> Habit #6: Don't Write Insecure Code
> http://msdn.microsoft.com/msdnmag/is...cureHabits/#S6

The article is talking about using MD5 for encryption, isn't it? As far as I
can tell, this has no impact on security to use MD5 to compare files.

--

Hal Rottenberg
blog: http://halr9000.com
powershell category:
http://halr9000.com/article/category...ng/powershell/

How is this insecure?

"Flowering Weeds" <floweringnoweedsno@xxxxxx> wrote in message
news:eQ3iMxZ7HHA.4712@xxxxxx

>
> "Brandon Shell"
>

>> Any thoughts

>

>> I have a function to get a MD5 of the files,

>
>
> Habit #6: Don't Write Insecure Code
> http://msdn.microsoft.com/msdnmag/is...cureHabits/#S6
>
>
>
>

"Hal Rottenberg"

>
> The article is talking about using
> MD5 for encryption, isn't it? As
> far as I can tell, this has no impact
> on security to use MD5 to compare files.
>

System.Security.Cryptography.HashAlgorithm Class

"Represents the base class from which all
implementations of cryptographic hash
algorithms must derive."

So to most, concerned with security,
"with regard to cryptography" seems
to apply to "compare files" too.