Holobuffer
A holodeck pattern buffer or "holobuffer" was a data storage system in which holographic programs were stored when they were not in use. Part of a ship's holodeck systems, it acted in a similar function to the transporter's pattern buffer.

In 2372, The Doctor transferred the mind of Danara Pel into the holobuffer and created a holographic body for her when she was dying from the Vidiian Phage. ()

In 2375, Seven of Nine assisted The Doctor in reconstructing deleted memories using residual photons in the holobuffer. ()

In 2377,  received a large transmission from Starfleet. Since the subspace transceiver was not designed to store holographic patterns, Harry Kim transferred the hologram to the holodeck's pattern buffer. ()
Holographic technology