zfs is great. i wanted to copy my bitcoin node to external drive but didn’t want to shut it off during the copy… so i shut down my node, did a snapshot of the drive (instant), then started it again.
#zfs snapshots keep a readonly, immutable state of the drive in that moment with very little overhead. So my zaps can keep working while i clone the node (snapshots are just symlinks on the drive). Very slick.
btrfs is great to exactly that same use-case. I've been running it on my laptops, desktops, and (some) servers for years.
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zfs is a bit of a pita when the kernel updates and things break
Why I use a filesystem that actually comes with Linux.
