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Unlike other programs, Access doesn’t require that you save your data. It automatically saves any edits you make to the records in a table. This automatic-saving process takes place every time you change a record, and it happens almost instantaneously. It also takes place behind the scenes, and you probably won’t notice anything. But don’t be alarmed when you exit Access and it doesn’t prompt you to save changes, as any change to your data is saved the moment you make it.
The rules are a bit different for database objects (Understanding Access Databases). When you add or edit a database object, Access waits until you finish and close the object, at which point it prompts you to save or discard your changes. If you’re a bit paranoid and you can’t stand the wait, just choose File?Save to save the current database object immediately.