Yes, upgrade from OS X El Capitan to macOS Mojave is absolutely possible. Check the below solution to upgrade from El Capitan to directly Mojave without facing any data loss problems.
Mac OS X El Capitan can be downloaded directly from the Apple website. The Beta version of the OS is available but the final version will be made available towards the Autumn season of 2015 as speculated by many Apple users. OS X built-in apps are even better in El Capitan. Safari now features Pinned Sites to keep your favorite websites open and active and a new mute button to quickly silence browser audio from any tab. Mail introduces Smart Suggestions, which recognizes names or events in a Mail message and prompts you to add them to your contacts or calendar with a single click.
Step 1: First Check your System Compatibility:-
First and foremost, make sure your Mac is compatible with macOS Mojave. In general, most Macs from 2012 or newer are compatible. Here's a list of Macs that can run macOS Mojave:-
1.1)MacBook (Early 2015 or newer)
1.2)MacBook Air (Mid 2012 or newer)
1.3)MacBook Pro (Mid 2012 or newer)
1.4)Mac mini (Late 2012 or newer)
1.5)iMac (Late 2012 or newer)
1.6)iMac Pro (2017)
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1.7)Mac Pro (Late 2013, plus mid-2010 and mid-2012 models with recommended Metal-capable GPU)
Step 2: Take Mac Data Backup
Before downloading any major update to your Mac operating system, it is very important to backup your data. The best way to ensure a smooth transition from an older operating system to Mojave is with Time Machine. If you don't already have a backup plan in place, there are a few options you can check out.
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Step 3: Download and install macOS Mojave
Apple has made it very easier to simply download and install Mojave, even if you are running an older operating system. If your Mac is running El Capitan, Sierra, or High Sierra, here's how to download macOS Mojave.
3.1)First, click on the Apple icon in the upper left corner of your screen.
3.2)Click on App Store.
3.3)Click on the Featured.
3.4)Click on macOS Mojave in the Mac App Store.
3.5)Click on Download under the Mojave icon.
3.6)Wait for macOS Mojave to finish downloading.
3.7)Click Install to begin the installation process.
After following the above steps, you will be able to upgrade your operating system from Mac OS X El Capitan to macOS Mojave.