If I update from 10.6.8 to Mavericks and I have a time machine backup, can I do a full restore back to 10.6.8 and resume as if I had never updated?

If I update from 10.6.8 to Mavericks and I have a time machine backup, can I do a full restore back to 10.6.8 and resume as if I had never updated if there is a problem?  Probably an answer I should know but I don't.  Thanks in advance!  (instruction suggestions welcomed)

Upgrading the OS is a system wide thing. So all users will receive the upgrade.
It should not delete files and such. However, if you have for example files made with Pages '09. Then the new Pages that comes with Mavericks will make a copy of those files so you can continue to edit them. But those new files can not be opened in Pages '09. BUT again, some people perfer Pages '09 and they use that still. Mavericks will just hide Pages '09, it's still usable in Mavericks just hidden.
To be safe, make a back up of your system before doing any major upgrade.
KOT

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