The Collaborative International Dictionary of English v.0.48:

Safe-keeping \Safe"-keep"ing\, n. [Safe + keep.]
   The act of keeping or preserving in safety from injury or
   from escape; care; custody.
   [1913 Webster]

WordNet (r) 3.0 (2006):

safekeeping
    n 1: the responsibility of a guardian or keeper; "he left his
         car in my keeping" [syn: guardianship, keeping,
         safekeeping]

Moby Thesaurus II by Grady Ward, 1.0:

53 Moby Thesaurus words for "safekeeping":
   care, charge, cold storage, conservancy, conservation,
   conservationism, cover, custodianship, custody, dead storage,
   defense, dry storage, environmental conservation, eye,
   forest conservation, forest management, guard, guardianship,
   guarding, hold, keep, keeping, lee, maintenance, preserval,
   preservation, preventive custody, protection, protective custody,
   refuge, safety, salvage, salvation, saving, shade, shadow,
   shelf-room, shelter, soil conservation, storage, storage space,
   stowage, stream conservation, support, sustentation, trust, upkeep,
   ward, warehousing, watchful eye, water conservation,
   wetlands conservation, wildlife conservation