Rebit &ldquo;SaveMe Express" Automatic Backup and Recovery Software for Single PC Protects one PC Includes - Software CD / PC Recovery CD Specifications - CD-ROM disk drive, 300 MB available hard disk space, NTFS formatted, non-RAID system drive, available USB 2.0 port, customer-supplied external USB 2.0 hard disk drive of equal or greater capacity than the internal system hard disk drives Compatible with 32-bit or 64-bit Windows XP and XP Pro (Service Pack 2 or Service Pack 3), 32-bit or 64-bit Windows Vista (Home Basic, Home Premium, Business, and Ultimate), and 32-bit or 64-bit Windows 7 (All Editions)