cryptsetup luksDump

This will display a list of all the LUKS partitions found on your system, along with their device names and UUIDs.

cryptsetup luksOpen /dev/mapper/<name> <mountpoint>

Replace `<name>` with the actual name of the LUKS partition you want to restore, and `<mountpoint>` with a suitable mount point for the partition. For example, if you want to mount the LUKS partition at `/mnt/mydata`, you would use the following command:

cryptsetup luksOpen /dev/mapper/<name> /mnt/mydata

btrfs restore -d <device> -s <source_file> -t <target_file>

Replace `<device>` with the device name of the LUKS partition (e.g., `/dev/mapper/<name>`), `<source_file>` with the path to the source file you want to restore, and `<target_file>` with the path where you want to restore the file. For example:

btrfs restore -d /dev/mapper/<name> -s /path/to/source/file -t /mnt/mydata/restored_file

This command will restore the contents of the source file to the target file on the LUKS partition.

cryptsetup luksClose /dev/mapper/<name>

Replace `<name>` with the actual name of the LUKS partition you want to close.

That's it! You have successfully restored a LUKS encrypted BTRFS partition using GRUB.