Hi Thomas,
You can keep your /home if there's only data there, but I have to warn you that you will NOT be able to use a 32 bits mysql /var/lib/mysql folder on a 64 bits system. You WILL have to use mysqldump and then reimport.
Could you please be a bit more specific about the mysql problem(s) one will get? I just thought about a similar migration, not from sarge but from etch 32 bit to etch 64 bit on a production machine.
Thanks, Claus -- CHECON EDV-Consulting und Redaktion Claus Herwig * Barer Straße 70 * 80799 München +49 89 27826981 * Fax 27826982 * c.herwig@checon.de