-R, \--recurse
: Recursively descend into subdirectories during `--create`.
+\--xdev, \--one-file-system
+: don't cross filesystem boundaries -- though as with tar and rsync,
+ the mount points themselves will still be handled.
+
\--numeric-ids
: Apply numeric IDs (user, group, etc.) rather than names during
`--extract` or `--finish-extract`.