Can the files be read on other devices after removing and inserting the group-hui hard disk?

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For example, Huigui has 4 hard drives, one of which is specifically for important data storage.
Due to network problems, it's difficult to synchronize to remote locations, so the method adopted is by sending it via post.
Btrfs file system.
Assuming you plug in the device into a Linux system, can you directly read files on the ones stored at Huigui? Are there any encryption?
Huigui does not do RAID.