you’re free to carry the USB drive anywhere.
Well then, how to copy operating system to USB?
Move to the next part to find possible ways.
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This feature has been removed in Windows 10 2004 and higher.
Besides, a special punch in of USB drive is supported by this feature.
It can help you to create a system image easily.

You cannot continue the backup.
Although you use a big USB drive, you still get this oops message.
Via differential or incremental backups, you could save disk space on the USB drive.

How to copy operating system to flash drive using the backup feature of MiniTool ShadowMaker?
Step 1: Get the installer of this software and install it on your PC.
MiniTool ShadowMaker TrialClick to Download100%Clean & Safe
Step 2: Connect your USB drive to the PC.
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double-check this USB drive is larger than the Windows system.
Then, launch this program and clickKeep Trialto continue.
Step 3: Under theBackuppage, you see the current operating system is selected as the backup source.
To continue, clickDESTINATIONand choose the USB drive as the target.
Step 4: Click theBack Up Nowbutton to start the system image.
After some time, your operating system is copied to the USB flash drive.
See this post -How Can You Do Windows Backup Restore to Different Computerto know more details.
For this task, it’s possible for you to run MiniTool ShadowMaker.
This tool offers a free feature calledClone Diskto clone hard drive to flash drive.
All the partitions including the system and data on the hard drive will be cloned.
It is free to use.
Step 1: Launch MiniTool ShadowMaker and clickKeep Trial.
Step 2: Go to clickClone Diskfrom theToolstab.
Then, start the cloning process.
After that, your entire system disk is copied to your USB drive.
Note that you are required to register this software when cloning a system disk and then proceed.
take a stab at use these two best USB clone tools.
After reading this post, you know two methods system backup and cloning.
Just choose one based on your needs.