All hardware-based backup media (hard drives, DVDs, CDs, or tapes) are prone to degradation and corruption over time. In many cases, the data contained on the media may become unrecoverable.
CrashPlan PRO Guaranteed Restore Technology automatically verifies and heals your backup archive data, ensuring your data is ready to be restored when you need it.
CrashPlan PRO runs integrity tests on backup files as often as each day to make sure the backed up files are healthy. Should even a single data block fail an integrity test, CrashPlan PRO detects the error and corrects the corrupted data block.
If CrashPlan PRO discovers an error that it cannot correct, you are notified by email about the affected file.