Casper Secure Startup Disk for PGP WDE 1.0.1798 | 95,5 MB The first and only PC backup solution designed for users of PGP Whole Disk Encryption, Casper Secure Drive Backup lets you keep a complete, fully-encrypted, instantly-bootable backup of your PGP whole disk encrypted system drive. When disaster strikes, you can use your backup as a complete and immediate replacement for your original hard disk.