Size of Site collection and all subsites
#Get Size of all Sub-sites in a Site Collection
[void][System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint")
# Function to calculate folder size
Function CalculateFolderSize($Folder)
{
[long]$FolderSize = 0
foreach ($File in $Folder.Files)
{
#Get File Size
$FolderSize += $file.TotalLength;
#Get the Versions Size
...
