How about making Time Machine BOOTABLE. That way if your internal HD dies, you can boot off your external HD until you get your internal HD replaced. Then you can backup your new internal HD with Time Machine again. Then boot off your new internal HD and never really skip a beat.
Let me take another crack at that... because the first time i only tackled bootability in a "one-dimensional" sense.
I totally dig the SuperDuper
philosophy. The whole
"get right back to work in minutes even though the HD is irrepairably fried and needs replacing" concept is excellent.
But i doubt that concept can always be applied so easily to the depths with which Time Machine might deal. For one thing: inside that Backups.backupd folder may reside backups for
several different bootable volumes. [perhaps not a frequent occurrence with basic "one-Mac" owners... but certainly possible in a household of Macs, or even a single user with multiple Macs and/or multiple bootable partitions on each Mac perhaps. (e.g., all my Macs have 2 OS partitions minimum).]
If so... then
which of those possible bootable backup volumes should Time Machine choose to make bootable on the backup disk? Nevermind how for now, but which? And then, how would it manage such decisions in a simple fashion? For example, should that pref be easily toggled by any user once set?
Much of the principle behind the technique Time Machine is using *requires* those files to be nestled together in those dated subfolders deep down in Backups.backupd for efficiency. So what you're
really asking for is to have it implement
two completely different tasks consecutively. (i.e., it would need to constantly maintain 2 "current" backups: one bootable, and one just the way it does now). And should the bootable version be updated every hour as well... or just daily?
Naw. Doesn't seem practical, as the various possibilities start making the overall process too complex (for both user and program). Just let Time Machine do that one thing it does. If a user wants to maintain a separate bootable, fully up-to-date clone (by using a utility other than Time Machine), to prepare for unrepairable disk failures...fine. All the
better in fact. Each program to its own purpose.