Os from 32 to 64 bit

Per my reading speculation is that Snow Leopard may or may not force 62 bit installation, than the opposite side is 32 bit installation will be allowed.
My business is centered on my iMac, financial records, Aperture, CS3, along with various 3rd party software purchase over the 2.75 years. (games, maintenance, various additional utilities, calibration tool, 6000+ photographs and the list goes on).
First backups are maintained but if Snow Leopards forces 64 Bit, would, after install of Snow Leopard how would these backup files be handled?
Also older programs purchased would they even run should a 64 bit environment be installed?
Apple support tells me to be certain to have system back up and inferred some programs may not run...that being the case, perhaps, it sounds as though it may be best I sit tight before installing Snow Leopard.
Anyone have definitive answers regarding my concerns? (Essentially, that would be developers of Snow Leopard familiar with it's impact on a 32 bit environment) Also what has been Apple's history when going from 15 bit to 32 bit...any of the "old timers" of Apple/Mac?
Thanks for your time and consideration!

"64 bit" will not affect the integrity of data files.
It may (or may not) affect applications.
It should be backwards compatible, in that if a program is not written for 64 bit, it should still execute in 32 bit w/o issue. Or it may load, but some subroutine won't work.
Look at it this way: it would be stupid for Apple to say 'on Aug 28, any existing software (of which 95% or more is 32 bit) will cease to function.'
There will likely be some older software, both commercial and utility, that won't work, or will only partially work.
I can't provide a functional (or fixed) definition of older, b/c all program(mer)s are not equal; some write cleaner/better code than others.
Similar to windows transition from 95 to 2000/XP, for PITA programs, Apple may have added an option to force an application to run in 32 bit vs 64.
I've been using Macs since late '85, so I guess I qualify as an 'old-timer'
Apple has been very good with backwards compatibility.
For your mission critical software, I would check the manufacturer web site for 10.6 compatibility prior to updating to 10.6.

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