When I first started using Time Machine, it showed backups for 15 days or maybe even a full month. Somewhere along the way it has changed to only showing 5 days of backups. I can not find an option for choosing how many days to back up. Is there one? How can I get back to longer periods of backups.

I remember once that TechTool Pro told me the disk I was using was close to full. I turned that option of notifying me off because I thought Time Machine would just start dropping the oldest days and recording the newest days automatically.


I've turned TM off right now as you can see in the pict.

A larger view of screen shot is here.