I need to reinstall Mountain Lion from a Time Machine backup, but it says that the last backup is 6 months old

Hi, I need to reinstall Mountain Lion on my MacBook Pro, so I made a backup yesterday and today I tried to reinstall everything from that backup.
To my surprise, Time Machine says that the last full backup was made on February!
I've always made regular backups during these months on my Time Machine HD, what can I do to reinstall everything from the backup I made yesterday?
Thank you very much.

Most likely, some folders were inadvertently excluded from your backups, and as a result you can't restore your data in Recovery, Setup Assistant, or Migration Assistant.
Starting from a fresh installation of OS X, set up a new administrator account and log in. Follow the instructions on this page to associate your existing backups with the new installation.
You should now be able to enter Time Machine and restore your user data from a snapshot.* I suggest you do this in two stages. Quit all applications except the Finder before you begin.
Restore all the visible items at the top level of your home folder.
Hold down the option key and select Go ▹ Library from the Finder menu bar. Enter Time Machine and restore all items in the Library folder. Log out and log back in as soon as the restore is complete.
Any other invisible folders or files at the top level of your home folder that you want to preserve will have to be restored separately. For most users, that isn't necessary.
You'll have to reinstall all third-party applications from scratch, or restore them from another kind of backup, if you have one.
*If you don't see any snapshots in Time Machine, exit the time-travel view and then hold down the option key while selecting
Browse Other Backup Disks...
from the Time Machine menu, which has an icon that looks like a clock running backwards. Select the backups of your computer by its previous name. If you don't have the Time Machine menu, open the Time Machine preference pane in System Preferences and check the box marked
Show Time Machine in menu bar

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