Remark :

In Maya, Alembic file are generally saved with their absolute paths on your PC
(instead of the relative one) and may be not found on the farm at rendering time.

(ex absolute: C:\Users\John\Desktop\Mayaproject\cache\Alembic\char1.abc
versus relative: ..\cache\Alembic\char1.abc)

To workaround this problem, you can:

• 1. Set the path used on the Farm :
  Rancheck your scene to generate your .vua archive,
  Create a directory “C:\Maya\Currentjob” (Exactly this string upper/lower cases include) where you can prepare you project.
  And follow the steps documented here: check_your_vua_archive

Or:

• 2. Import your alembic as references in the scene, using the Maya→File→Reference Editor, then Save and RANCheck your scene.