I have almost completed the preliminary steps for upgrading one of my iMacs to El Capitan. I have backups of Mountain Lion to SuperDuper! and also I have Time Machine turned on, with a 2 Gbyte drive attached. I also have another backup of Mountain Lion to Carbon Copy Cloner from another machine, so I reckon I've got Mountain Lion covered for the moment.
I suspect I can also get backups for Yosemite from mrs d's laptop, and a backup for Mavericks from another family computer, so that if necessary I could reinstall all of those systems. I really don't want to have to do that, but I'm trying to cover most bases.
So - finally, two points:
1. I have cleared spare space of about 40 Gbytes from the 500 or so Gbyte main drive. Is that enough to enable the upgrade to take place? I think the installer files themselves occupy less than 16 Gbytes, as suggested by various writers discussing booting from USB memory sticks. Maybe it doesn't matter, but I wasn't intending to do a clean install. I could do that if really advised, then load up all the important files again, but if possible I'd prefer not to, as that would probably take quite a few hours. I could clear more space, but I'm hoping that 40 Gbytes will be enough.
2. Do I unplug the Time Machine drive before I download and install the El Capitan system? Does it matter if I do or not?
I have no idea what TM does across upgrade versions of Mac OS X - whether it even manages to make itself incompatible with itself. Someone else might have tried this. I have not always found TM to be ultra reliable - which is why I have CCC and SD! clones as well.
I suspect I can also get backups for Yosemite from mrs d's laptop, and a backup for Mavericks from another family computer, so that if necessary I could reinstall all of those systems. I really don't want to have to do that, but I'm trying to cover most bases.
So - finally, two points:
1. I have cleared spare space of about 40 Gbytes from the 500 or so Gbyte main drive. Is that enough to enable the upgrade to take place? I think the installer files themselves occupy less than 16 Gbytes, as suggested by various writers discussing booting from USB memory sticks. Maybe it doesn't matter, but I wasn't intending to do a clean install. I could do that if really advised, then load up all the important files again, but if possible I'd prefer not to, as that would probably take quite a few hours. I could clear more space, but I'm hoping that 40 Gbytes will be enough.
2. Do I unplug the Time Machine drive before I download and install the El Capitan system? Does it matter if I do or not?
I have no idea what TM does across upgrade versions of Mac OS X - whether it even manages to make itself incompatible with itself. Someone else might have tried this. I have not always found TM to be ultra reliable - which is why I have CCC and SD! clones as well.
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