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btrfs check --repairafter a backup seems the most viable and sensible solution. I recommend the OP use something such as Clonezilla for backing up the whole partition orbtrfs-clonefor copying the filesystem (better option).dfshows myUse%as26%and everything else is the same (except for theMounted onwhich is/for one and/homefor the other) for the same file system on 2 lines of output.pvdisplay,vgdisplayandlvdisplayshow nothing probably because of the read only filesystem.pvsdoes not show anything then you do not have LVM (or it is broken, configured in a way that it does not find the PVs). If you do not have any spare storage then you can try using RAM as CoW volume; usually not that much is written byfsck. So either create a block ram disk (dev/ram0,modprobe brd ...) or create a file intmpfs(/dev/shm) and set up a loop device on top of it (losetup).btrfs-clonehas the advantage of reconstructing thebtrfsfilesystem in the target filesystem.