Re-start from Clone?

[omarkn]

SD 2.8 (96)

Originally Posted by dnanian

Well, fortunately, you can still "test" - you just boot "manually" rather than having SD do it.

Also related to thread: "Can't boot from El Capitan backup"

I have El-Cap on the MacHD with Yosemite on the xHD.

After setting the start-up drive in the Sys.Pref.; I still can't start up from the external drive (xHD). I get a circle with a line in it.

Should I do a "backup all files" with SD and then try again? ( I wanted to keep Yosemite for a while.)

And why should we not use Sandboxing when it states in the UG:

”A Sandbox is a bootable copy of your system, stored on another hard drive
or partition, that shares your personal documents and data with the
original.”

/
with best regards,
Omar K N
Stockholm, Sweden