Make Debian Fun Again And Learn How To Do Other Cool Stuff Too

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As per: https://github.com/kdave/btrfs-progs/issues/319

mdata should be dup by default so your btrfs filesystem can handle errors more easily.

You can check if this is the case for you by using command:

sudo btrfs fi df /

You will see something like:

In this image Metadata is already DUP however it might say that your metadata is Single such as:

Data, single: total=287.01GiB, used=206.46GiB

System, single: total=32.00MiB, used=64.00KiB

Metadata, single: total=10.01GiB, used=5.35GiB

GlobalReserve, single: total=512.00MiB, used=0.00B