Most safekeeping entities operate on an actual receipt of funds basis, subject to delayed credit until securities transactions actually settle. Bank custodians typically operate on a contractual settlement basis and offer comprehensive reporting, including roll-ups and customizable reporting options.
Safekeeping means protecting or guarding an object. You might put a batch of cupcakes on top of the refrigerator for safekeeping, hoping to keep them safe from your hungry roommates until after dinner.