Below is an example of Poweshell commands used to restore and object in an encrypted backup:
import-module 'C:\Program Files\Dell\Recovery Manager for Active Directory Forest Edition\QuestSoftware.RecoveryManager.AD.PowerShell.dll'
$BackupPwd = Read-Host "Enter the backup password" -AsSecureString
$b = get-rmadbackup -id 73
$object = Get-RMADObject -ID "CN=Username,CN=Users,DC=domainname,DC=com"
Restore-RMADObject -ID $object.objectinfo.dn -Backup $b.backupguid -BackupPassword $BackupPwd -noreport -useagentlessmethod
The distinguished name above is just an example. Use the "get-rmadbackup" to obatin the backup ID for the backup required. Use "get-help get-rmandbackup" for more information.