If I upgrade to Yosemite, can I revert back if I want?

I would like to try upgrading to Yosemite, but I'm sceptical as there is a lot of bad feedback with it. So if I do, and I find too many problems, can I revert back to Mavericks?

TTeddyau wrote:
I would like to try upgrading to Yosemite, but I'm sceptical as there is a lot of bad feedback with it. So if I do, and I find too many problems, can I revert back to Mavericks?
YES you can.  See this thread with 500+ replies
https://discussions.apple.com/thread/6604300?tstart=0
However, you rarely - if ever - hear from those who have no problems with Yosemite.
More RAM is always good if your machine can support it.
Make a backup and upgrade.

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