On October 1, 2014, its first preview version appeared.
Generally, each operating system has its lifecycle.
Speaking of Server 2016 end of life, Microsoft ended its Mainstream Support on Jan 11, 2022.
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After that date, the system wont receive some updates but security updates are still available.
Besides, Server 2016 wont receive any bug fixes or improvements.
That is, the final Server 2016 EOL lasts until Jan 12, 2027.

Windows Server 2012 and 2012 R2 reach the end of support on October 10, 2023.
This post will provide more details about Windows Server 2012 R2 end of life.
Eventually, manufacturers cannot patch and update the old system because of outdated architecture.
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To prevent file loss, run thebackup software MiniTool ShadowMaker for data backup.
Now, download and install it on your Server 2016 for data backup.
Step 3: InBackup, clickSOURCEto choose an external drive or USB drive.

Step 4: ClickBack Up Nowto begin file backup.
Step 2: Right-press the ISO and choose Mount.
Step 3: Double-pick the setup.exe file and then the Windows Server Setup window opens.
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Step 4: Choose an edition of Windows Server 2022.
Step 5: Finish the update by following the on-screen instructions.
What is Windows Server 2022 end of life?
What does it mean?
How to back up your PC for data protection after EOL?
Find details in this guide.
To keep data safe, you had better back up crucial files before the update.