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Re:Tails 3.0 Released by stevekemp on Tuesday June 13, 2017 @10:38PM (#14550336)
A lot of hosting companies run KVM/qemu/Xen or even UML with 32-bit guests by default. But yeah in terms of physical computers 64-bit has long been the default.

I remember upgrading from 32-bit to 64-bit in-place a few times, which is a bit fiddly but not impossible with Debian. I wrote up a couple of guides once upon a time, but right now I can just find this old wiki-page discussing the process:

https://wiki.debian.org/Migrate32To64Bit

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