The EFI partition contains the boot files and the boot configuration database (BCD). Some OEMs also store the BIOS image backups and additional tools in the EFI partition. This post explains how to back up the files in the EFI partition.
Backup the EFI System Partition
The EFI partition has a special partition identifier, so Windows doesn’t assign a drive letter to it by default. To access the partition and back up the data from that partition, please do the following:
Open Command Prompt (admin) and run the following commands:
mountvol Y: /s robocopy y:\ C:\Backup /mir bcdedit /export C:\Backup\EFI\Microsoft\Boot\BCD
The above commands recursively copy all files from the EFI partition to the C:\Backup folder. The BCD is also exported.
After running the commands, verify that the BCD, boot files, and OEM tools (if any) have been successfully copied to C:\Backup. You may then move the C:\Backup folder to an external drive if required.
Related articles
How to Resize the EFI System Partition in Windows
How to Rebuild the EFI Boot Partition, BCD and Boot Files
How to Fix the EFI Boot Partition’s ID Using DiskPart
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