> on my Macs use Time Machine Time Machine for the Mac is excellent--I use it myself--but I must say that it is not sufficient by itself for the following reas

> on my Macs use Time Machine Time Machine for the Mac is excellent--I use it myself--but I must say that it is not sufficient by itself for the following reasons: (1) Since the Time Machine backup drive is typically online all the time, it is vulnerable to malware that'll encrypt, corrupt, or erase you backups. (An example from the Windows world is CryptoLocker: http://en.wikipedia.org/wiki/Cryptolocker http://en.wikipedia.org/wiki/Cryptolocker ). (2) I imagine that most Time Machine users will have the Time Machine drive right next to their Mac. So whatever physical trauma befalls their Mac--fire, theft, electrical overvoltage--is going to affect their Time Machine drive as well. Time Machine users need a real offline backup as well. (I realize that you said that you use also use CrashPlan, a remote backup system, so my comment is not directed at you.)