After 10.8.3 update, time machine rebackups all the files in the home

Yesterday evening I have updated my MacBook Pro'11 from 10.8.2 to 10.8.3
Next time machine backup works for the whole night and now I can see that it rebackups the whole home user folder. It shows all the files in my home directory have been changed somehow. As a result, a huge amount of backup history is dropped on the time machine backup drive.
Is it okay? Why TM thinks my 350 GB of personal files have been changed after system update?

Ok, I didn't go in and check every file on the iMac last night when it did a full backup so will take your word for it.  Doing this once with the new install seems reasonable to me, and with the large external drives I use is not a problem...well, except for the noise the drives make for such a long time will writing the backup
I am just happy knowing there is a good base for rebuilding the internal drive if I need it.

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    However when I do go in to Time Machine it seems to show that for the last 3 days scurity copies have been done.
    But when I try to do a a new security copy invariably the top menu says that copy has failed.
    Has anyone experienced the same thing? Is there anyway to check clearly if Time Machine is now working properly or not?
    Thank you for any replies...
    MF

    Dear Matt,
    Basicaly I think what happened was what your article describes:
    Time Machine keeps track of files and folders that have changed since your last backup so that it only backs up those files and folders. If Time Machine loses track of files and folders that have changed since the last backup, it compares an "inventory" of your current data to an inventory of your backup. When this happens, Time Machine preferences displays a "Preparing..." status message for a longer period of time. See Mac OS X 10.5: Time Machine preferences may display "Preparing" for a longer time.
    Message: Time Machine starts a new, full backup instead of a smaller incremental backup
    However none of the reasons the article presents were the cause I think, since I only tried to backup after the installation of Mavericks. Maybe time capsule hadn't updated right after? I really don't know. However I am glad to say that the problem seems to have fixed itself. It took a long time preparing a backup and finally did a complete backup of roughly 200GB which took a while. (which I am still to verify if it has deleted backups from before the installation of Mavericks due to lack of space).
    Anyhow its backed up and seems to be working fine now. As to why it's happened and how it got fixed or what the problem actually was... I really don't know.
    Thank you for the reply, it was helpful at least to determine what might have gone wrong.
    Best,
    Miguel F

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