/etc/netatalk/afp_voluuid.conf is the configuration file used by afpd to specify UUID of Time Machine volume automagically. The configuration lines are composed like:
"volume name" uuid-string
The first field is volume name. Volume names must be quoted if they contain spaces. The second field is the 36 character hexadecimal ASCII string representation of a UUID.
The leading spaces and tabs are ignored. Blank lines are ignored. The lines prefixed with # are ignored. The illegal lines are ignored.
This UUID is advertised by Zeroconf in order to provide robust disambiguation of Time Machine volume.
The afpd generates the UUID from random numbers and saves it into afp_voluuid.conf, only when setting "tm" option in AppleVolumes file.
This file should not be thoughtlessly edited and be copied onto another server.
Example. afp_voluuid.conf three TM volumes on one netatalk
# This is a comment. "Backup for John Smith" 1573974F-0ABD-69CC-C40A-8519B681A0E1 "bob" 39A487F4-55AA-8240-E584-69AA01800FE9 mary 6331E2D1-446C-B68C-3066-D685AADBE911