[GENERAL] Filesystem level backup and 32 / 64 bit

[NTPT]

I have situation where I have one box with linux  native 64 bit distribution 
(Gentoo on AMD) running pg 8.x and other box running a 32 bit distro 
running version of pg 8.x

Is it posssible  to take a "filesystem level backup" (copyiing all in 
$PGDATA directory) from 64 bit system and use it as $PGDATA in the native 32 
bit system with the same version of postgresql ?

Ie to have one big 64 bit server and eventually a small but cheap 32 bit box 
as an emergency backup  ? 

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