Can't boot from El Capitan backup
I've been having problems with my 10.11.1 update (runs very slowly) and want to do a clean install. I have SuperDuper! backups of 10.11.1 and 10.10 on my external hard drive. I did a new backup last night of 10.11.1 to prepare for the clean install. I tried to reboot from it this morning and after logging in it freezes at a black screen. Why?
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