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Re:ntfs2btrfs: In-place conversion of NTFS filesystem to Btrfs by LeoPanthera on Monday March 07, 2022 @01:20PM (#30591348)
VDO provides a compression and duplication layer for any traditional filesystem.

https://www.redhat.com/en/blog/look-vdo-new-linux-compressio...

Re:ntfs2btrfs: In-place conversion of NTFS filesystem to Btrfs by cmurf on Monday March 07, 2022 @02:34PM (#30592313)
VDO isn't in the mainline kernel still.