In terms of data storage:
* Delete: Permanently removing data.
* Discard: Throwing away or getting rid of something.
* Destroy: Completely obliterating data.
* Purge: Removing unwanted or obsolete data.
In terms of preservation:
* Disperse: Scattering or distributing items.
* Dispose: Getting rid of something.
* Abandon: Leaving something behind without intending to return.
* Neglect: Failing to maintain or care for something.
In terms of accessibility:
* Suppress: Hiding or concealing information.
* Censor: Restricting access to certain information.
* Obscure: Making something difficult to find or understand.
The most appropriate opposite will depend on the specific situation and what you're trying to convey.