Backup, Restore and Enable Dev Site Feature of Site Collection Using Powershell Script

Backup SIteCollection
 Backup-SPSite http://sitename.com/ -Path D:\backupfilename.bak –UseSqlSnapshot

Create New SiteCollection
Get-SPWebTemplate
$template = Get-SPWebTemplate "DEV#0"
New-SPSite -Url "http://domain:port/sites/sitename" -OwnerAlias "domain\username" -Template

Restore SiteCollection Backup
Restore-SPSite -Identity http://domain:port/sites/sitename  -Path "D:\backupfilename.bak" -Verbose -


Enable Developer Site Feature
Enable-SPFeature e374875e-06b6-11e0-b0fa-57f5dfd72085 -url http://domain:port/sites/sitename