- "By default, this will send the whole subvolume. To do",
- "an incremental send, one or multiple '-i <clone_source>'",
- "arguments have to be specified. A 'clone source' is",
- "a subvolume that is known to exist on the receiving",
- "side in exactly the same state as on the sending side.\n",
- "Normally, a good snapshot parent is searched automatically",
- "in the list of 'clone sources'. To override this, use",
- "'-p <parent>' to manually specify a snapshot parent.",
- "A manually specified snapshot parent is also regarded",
- "as 'clone source'.\n",
- "-v Enable verbose debug output. Each",
- " occurrency of this option increases the",
- " verbose level more.",
- "-i <subvol> Informs btrfs send that this subvolume,",
- " can be taken as 'clone source'. This can",
- " be used for incremental sends.",
- "-p <subvol> Disable automatic snaphot parent",
- " determination and use <subvol> as parent.",
- " This subvolume is also added to the list",
- " of 'clone sources' (see -i).",
- "-f <outfile> Output is normally written to stdout.",
- " To write to a file, use this option.",
- " An alternative would be to use pipes.",
+ "By default, this will send the whole subvolume. To do an incremental",
+ "send, use '-p <parent>'. If you want to allow btrfs to clone from",
+ "any additional local snapshots, use -c <clone-src> (multiple times",
+ "where applicable). You must not specify clone sources unless you",
+ "guarantee that these snapshots are exactly in the same state on both",
+ "sides, the sender and the receiver. It is allowed to omit the",
+ "'-p <parent>' option when '-c <clone-src>' options are given, in",
+ "which case 'btrfs send' will determine a suitable parent among the",
+ "clone sources itself.",
+ "\n",
+ "-v Enable verbose debug output. Each occurrency of",
+ " this option increases the verbose level more.",
+ "-p <parent> Send an incremental stream from <parent> to",
+ " <subvol>.",
+ "-c <clone-src> Use this snapshot as a clone source for an ",
+ " incremental send (multiple allowed)",
+ "-f <outfile> Output is normally written to stdout. To write to",
+ " a file, use this option. An alternative would be to",
+ " use pipes.",