How do I create a vdisk snapshot on a btrfs device?   There are two methods of creating instant copy/snapshot with btrfs, if it's a single file like a vdisk use the first one, if you want to snapshot an entire folder use the 2nd, e.g., I have all my VMs in the same folder/subvolume so with a single snapshot they are all backed up instantly.   Method 1 - Creating a reflink copy:   Simple way for making an instant copy of a vdisk creating a reflink copy, which is essentially a file-level
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