'saver' originates from English, specifically formed from the verb 'save' + the agentive suffix '-er'. 'Save' itself comes from Old French 'sauver' and Latin 'salvare', ultimately from Latin 'salvus' meaning 'safe'.

'saver' developed after the verb 'save' entered English (Middle English 'saven'/'save'); the agentive suffix '-er' was added to form 'saver', meaning 'one who saves' or 'that which saves'.

Initially related to making safe ('to save' = 'to make safe'), the sense broadened to include preserving money/resources and to refer to devices or methods that save time or effort; 'saver' therefore came to mean 'one who saves' and 'something that saves'.