atime
Specifies whether to preserve metadata indicating the last time a file was read or written to.
The behavior of Atime isn't fully standard across platforms, so DataSync can only do this on a best-effort basis.
BEST_EFFORT(default) - DataSync attempts to preserve the originalAtimeattribute on all source files (that is, the version before thePREPARINGsteps of the task execution). This option is recommended.NONE- IgnoresAtime.
If Atime is set to BEST_EFFORT, Mtime must be set to PRESERVE.
If Atime is set to NONE, Mtime must also be NONE.