I have IMAC 10.6.8 version , Would like to know if I change to MAVERICK OS I WILL HAVE NO PROBLEM in terms of my existing files etc

I have personal data and other files stored in OS

Although upgrading shouldn't damage your data/personal files, before any upgrade it is essential you have tried and tested full backup (Time Machine or a clone) so that you can restore to the previous state if things go wrong, or for whatever reason you want to revert.
Check the tech specs to make sure your Mac is compatible with the upgrade, and although 2gb RAM is stated as the requirement, real world use suggests that anything less than 4gb and Mavericks will be a very slow performer:
https://www.apple.com/osx/specs/
A possible problem you may face is that older PowerPC apps will no longer work in Mavericks (or Lion, Mountain Lion) as Rosetta, which enabled older apps to run is no longer supported/included in the OS. Check carefully the compatibility of any apps you rely on in your workflow. Here's a fairly comprehensive compatibility list:
http://roaringapps.com/apps
You could be faced with having to upgrade or replace several apps.

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