I want to revert to Yosemite


is possible revert yosemite out backup? have been having major issues el capitan since installing beta. computer running if had xp , 1gb of ram. (i have late 2013 27" imac 16gb of ram)
before ask, yes, did make before installing el capitan. once realized how terrible beta started restore yosemite up. unfortunately, roomy knocked drive off of desk destroying everything. i'm musician, lost lot of sentimental stuff. want move on , able load webpage in under minute again.
great if didn't lose audio after 2 hours of use...
 

i don't think can without proper backup.

best can try install yosemite in partition, , try migration assistance.

tbo, never try migrate newer system older system. sure can't restore system setting method, may able recover user data.

or, install yosemite in new partition, , manually move files in, remove el capitan partition.
 


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