Just in addition to Suren's answer, you might want to take a look at the Supported Platforms page to make sure you'll have the whole environment with supported technology: https://confluence.atlassian.com/display/DOC/Supported+Platforms
And check the plugins compatibility might also be a good approach before you choose the target version: https://confluence.atlassian.com/display/UPM/Checking+add-on+compatibility+with+application+updates
I hope it helps!
Yes, you can.
Before you upgrade please backup :
* Your External Database.
* Your Confluence Home Directory.
* The Confluence installation directory
You can get more info regarding Upgrading in the below Documentation:
I suggest you to create a test environment and perform the upgrade in the test environment before you proceed upgrading in production side. By doing this it will give *low impact* on your side and can avoid any issue while upgrading on production side.
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