Good advice from Jay Jrijenhoek on Mac backup strategies.
When was the last time you tested your backups to verify they are actually working?
Keep multiple clones on each Mac, and check one per week.
The most reliable way to verify your backed up data is in good shape is by simply restoring it.
That’s a tedious process with Time Machine, but rather simple and easy with a cloned Mac. Simply startup the Mac from the backup clone.