Create a snapshot of an Azure BLOB via PowerShell.

CreateSnapshot.ps1

# step 1: get file
$blobFile = Get-AzureStorageBlob -Container source | Where-Object -Property Name -eq "version.txt"

# step 2: create snapshot
$cloudBlob = $blobFile.ICloudBlob
$cloudBlob.CreateSnapshot()

# step 3: get snapshots
$snapshot = Get-AzureStorageBlob -Container source | Where-Object -Property SnapshotTime

# step 4: download snapshot
$snapshot[0] | Get-AzureStorageBlobContent

Here's an example using AZ commands to pull all containers and blobs in a storage account and take a snapshot. The 3rd line with -eq $null filters out the existing snapshots, since a snapshot cannot be taken of another snapshot.

$blobstest = Get-AzStorageAccount | Where-Object -property StorageAccountName -eq 'storageaccountname' | Get-AzStorageContainer | Get-AzStorageBlob
$cloudBlob = $blobstest.ICloudBlob | Where-Object -property SnapshotTime -eq $null
$cloudBlob.CreateSnapshot()