Mujh ko aap k excel k version k pata nahee. Phir bhee try.
jab Aap save as k option m jate hain tu is window m tool k dropdown m se general option par click karain. Wahan par aik dialogue box hota ha jo ka "Always create backup" is par enable kar ka save kar dain. aap jab bhee apni origional file m changes karain ge wo automatic backup file m change ho gae ga.
regards.
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