Data Lifeguard Diagnostic is not available for Linux but there are a few alternatives that runs on Linux with similar functionality. The best Linux alternative is GSmartControl, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to Data Lifeguard Diagnostic and three of them are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to Data Lifeguard Diagnostic are smartmontools (Free, Open Source) and diskscan (Free).
The smartmontools package contains two utility programs (smartctl and smartd) to control and monitor storage systems using the Self-Monitoring, Analysis and Reporting Technology System (SMART) built into most modern ATA and SCSI harddisks.
Diskscan is intended to provide the information needed to decide if a disk is good or not, be it an HDD or an SSD it is likely to be holding important data and if you have a suspicion that it is failing it is also important to know how bad is it down the road.