Currently Being ModeratedNov 12, 2012 10:26 PM (in response to baltwo)
Yep, I've been through that already. It doesn't seem to answer this either directly or indirectly: "...
what Time Machine is likely to do when a backed up non-system drive like my 1TB one dies? Please tell me that the default is not that it will immediately delete backups of it..."
Currently Being ModeratedNov 13, 2012 1:53 AM (in response to mcintosh_i)
Ah! The proverbial missing information. Best I can offer, since I don't use TM, preferring bootable clones that I keep up to date.
As for your question, if your non-system disk isn't being backed up, then TM has nothing to do with it. Maybe I'm missing something.27" i7 iMac SL, Lion, OS X Mountain Lion (10.8.2), G4 450 MP w/Leopard, 9.2.2
Currently Being ModeratedNov 13, 2012 2:19 PM (in response to baltwo)
Sorry if I wasn't clear, but my problem is that I have 2 internal drives, BOTH of which were being backed up by TM, and now that one of them (the non-system disk) has died, I'm concerned that TM thinks because that drive "doesn't exist anymore" that it doesn't need to back it up OR keep old backups of it.
Currently Being ModeratedNov 13, 2012 7:27 PM (in response to mcintosh_i)
. . .
I've found on google that the default behaviour of Time Machine is that if the state of your Volumes changes, i.e. a drive is added or removed, that Time Machine will delete all old backups and start again with a fresh drive.
Not so (as long as there's room on your TM drive).
Each drive is backed-up separately. Once a drive is no longer connected, of course it won't be backed-up anymore, but the old backups aren't deleted automatically or immediately.
However, when the TM drive does get full, and TM has to start deleting old backups, sooner or later, it will delete the last remaining backup of the missing drive.
If you replace a drive, it will probably be treated as a new one (depending on the circumstances), and be backed-up in full on the next backup, requiring a lot of space, and, if necessary, a lot of old backups to be deleted. Thus you might lose the old backups fairly quickly.
In some circumstances, if you replace your OSX drive, Time Machine will automatically "assocate" the new drive with the old backups, so only the changes will be backed-up. As far as I can tell, that doesn't happen automatically with a data-only drive.
Effective with Lion, however, you can manually tell Time Machine to "associate" the new data-only drive with the old backups, via the procedure in #B6 of Time Machine - Troubleshooting. That's a bit tedious, unfortunately, but if you're careful, it does work.
Can anyone enlighten me on what Time Machine is likely to do when a backed up non-system drive like my 1TB one dies? Please tell me that the default is not that it will immediately delete backups of it.
Correct. It will not immediately delete the backups.
You may not see them easily via the Time Machine browser, however, as you normally start from a folder on an existing drive, then Enter Time Machine to display the backups of that folder. Since the drive in question is not present, you can't start from it. Unfortunately, Apple doesn't make it clear how to do that, but the procedure in #E3 of Time Machine - Troubleshooting should work.
Currently Being ModeratedNov 13, 2012 11:24 PM (in response to Pondini)
Wow, brilliant answer Pondini, thankyou for that very clear explanation. When I get home from work tonight I'll follow your recommendations, and will hopefully be a happy camper - in which case I'll definitely click the "solved my question" button. Thanks again.