An article reviewing the majority of current mac backup software reaches an uncomfortable conclusion: (Most)Mac Backup Software [is] Harmful

The surprising conclusion is that almost all Macintosh backup or cloning programs do not fulfill their primary purpose, i.e., they are not able to restore files with all associated metadata. This is despite the fact that many of the tools are advertised as “safe”, “accurate”, “bug-free”, etc. The tools that fail are harmful because they generate a false sense of security. Even more exasperating is that many of these tools cost (significant amounts of) money. The only laudable exception is the great SuperDuper application, which performs flawlessly.

Funnily enough, as is sadly too often the case, SuperDuper is free (with added features for money), whereas many of the other applications reviewed are not.