A have a MacBook running Mountain Lion that backups up to a Linux machine over afp (netatalk) using Time Machine.
In Time Machine preferences I can see that the Oldest backup was on 5th March 2012 (a year). If I go to 'Enter Time Machine' I can old go far back as 4th of March 2013 (a week). Using the 'tmutil' command I can see 43 backups from 2012 until an hour ago.
There has never been a problem with space on the Linux machine and there has been little change to settings or software on either computer for over a week.
Is there a way I recover from these missing backups? How can I prevent this occurrence from happening again? I do not need anything from this backup at the moment but I still want the ability to do so.
[EDIT] So one of the comments below got me thinking. There are two interfaces on this computer. One is set statically with a hostname and IP address, the other is by DHCP and takes the default Mac OSX hostname.