Time Machine stopped backing up earlier this month and I have done numerous things to get backups again. Yesterday after upgrading memory on my iMac I restarted Time Machine and it appeared to be backing up just fine. This morning when I looked at Time Machine preferences it does not display oldest or latest backup and when I open disk it shows 2015-01-24-083208.inProgress and if you look inside package it appears to have backups all the way back to when I started Time Machine back up. I have reformatted the drive during the process of trying to get backups working again and run disk utility and drive checks out fine. When it does a backup it shows progress bar and when complete tells when next backup is. I browsed through the folders in the 2015-01-24-083208.inProgress package and they do appear to be complete backups.