Hey yall, I've got a question regarding data loss. I have a mid-2011 21.5" iMac (2.6 Ghz core i5, 16gb DDR3, AMD Radeon HD 6770M 512 MB, and a 1TB SATA HDD), and it currently natively supports macOS 10.13 Sierra. I have some data that needs to stay in 10.13, and I was wondering if it was possible to dual-boot 10.13 and 15. If anyone has any knowledge regarding the Data loss, then please let me know. Thanks!
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