Upgrade external HD from Mavericks to Yosemite

Hi,
On my MBP I have installed Mavericks 10.9.5.
Then I have a couple of external hard drive with a clone of Mavericks 10.9.5.
If I have a cloned hard drive plugged in (not booting off from it), and I run the installer of Yosemite and I tell to install Yosetime on the external hard drive (where there’s a clone of Mavericks 10.9.5) what would then happen.
Would Yosemite erase everything from the clone, or would the clone upgrade from Mavericks to Yosemite, else?
Thanks

G.Alby wrote:
If I have a cloned hard drive plugged in (not booting off from it), and I run the installer of Yosemite and I tell to install Yosetime on the external hard drive (where there’s a clone of Mavericks 10.9.5) what would then happen.
Would Yosemite erase everything from the clone, or would the clone upgrade from Mavericks to Yosemite, else?
Thanks
No, the Yosemite install will not erase everything on the clone.
Yes, the clone would upgrade from Mavericks to Yosemite. All your apps and data will not be touched.
I actually did something similar onto an SD card. I installed Yosemite 10.10, apps and data. Then later, I ran the 10.10.1 installer against the SD card and all that happened was Yosemite updated from 10.10 to 10.10.1. Nothing else was touched.

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