Implemented the creation of backing disks

src/backing.h

@@ -36,7 +36,7 @@ uint64_t get_backing_creation_time(const char* backing);
 char* find_latest_backing(void);
 
 /// @brief Creates a new backing disk.
-/// @param backing_disk The disk to use as the backing disk. Warning: the disk must be part of the backing disks.
+/// @param disk The disk to use as the backing disk. Warning: the disk must be part of the backing disks.
 /// @param description The description of the backing disk.
 /// @return true if the backing disk was created, otherwise false.
-bool create_backing(const char* backing_disk, const char* description);
+bool create_backing(const char* disk, const char* description);