There shall be a separate or set of tapes for each backup day including Monday, Tuesday, Wednesday, and Thursday. There shall be a separate or set of tapes for each Friday of the month such as Friday1, Friday2, etc. Backups performed on Friday or weekends shall be kept for one month and used again the next month on the applicable Friday. Backups performed Monday through Thursday shall be kept for one week and used again the following appropriate day of the week.