Before You Update Your OS: Backup and Accessory Checklist

A practical checklist for backing up, checking compatibility, and preparing accessories before a macOS, Windows, iOS, or Android update.

Quick answer

Before a major OS update, make a current backup, verify that your important apps support the new version, keep recovery media or credentials ready, and confirm chargers, hubs, and external storage work before you start.

Last updated 2026-08-11

Pre-update checklist

Back up first: use Time Machine, File History, a full-disk backup tool, cloud sync, or a vendor recovery tool before changing the OS.
Check app compatibility: confirm the latest version and supported OS on the developer's official site. You can start with the What-Version latest-version trackers.
Verify architecture labels: Mac users should confirm Apple Silicon vs Intel downloads. Windows users should confirm ARM64 vs x64 vs x86 installers.
Save recovery access: keep your password manager, recovery keys, two-factor device, and installer account credentials available outside the device being updated.
Test your power and ports: plug in the charger, backup drive, and any adapter you expect to use before the installer starts.

Accessory checks that prevent common update problems

External storage: make sure the backup drive has enough free space and mounts normally.
USB-C or USB-A adapters: confirm the adapter works with your drive, keyboard, or Ethernet dongle.
Recovery media: if your OS supports a bootable installer or recovery drive, prepare it before the update rather than after something fails.
Network fallback: for laptops with unreliable Wi-Fi after updates, know whether you can use Ethernet, phone tethering, or a known-compatible adapter.

After the update

Open your core apps before you need them for real work. Confirm the app launches, your data is visible, and any browser, VPN, password manager, developer tool, or driver you rely on is on a supported version. If a download page offers multiple builds, use the relevant What-Version guide before reinstalling.

Frequently Asked Questions

Do I need to buy accessories before every OS update?

No. Use what you already have if it works. The checklist is meant to help you verify backups, power, ports, and recovery options before the update starts.

What is the most important thing to do before a major OS update?

Make a current backup that you can actually restore from. Then check compatibility for the apps and drivers you rely on every day.

Should I update apps before or after the OS update?

Update critical apps before the OS update when the developer says the newer app version supports your current OS and the target OS. Recheck after the update for any OS-specific fixes.

Sources and scope

This guide answers

What should I check before a Mac or Windows operating-system update?

What this cannot prove

A checklist reduces avoidable risk but cannot guarantee vendor compatibility, backup recovery, hardware support, or a successful update on every device.

Editorial review by What-Version Editorial · reviewed 2026-08-11

Official and methodology sources