Backing up to ordinary shares (as described here: Making Time Machine work with the ReadyNAS) is not supported.
If you are comfortable with editing the netatalk config on your ReadyNAS e.g. using SSH (or a config backup) you can use other shares.
The home share locations for users are specified in the /etc/passwd file. The home share for the "ReadyNAS" (TM user on the ReadyNAS) is /var/lib/timemachine
If you look at this location using SSH you'll see a file called ".AppleVolumes" which specifies the location to be used for TM backups:
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MDGM-NAS:~# cat /var/lib/timemachine/.AppleVolumes
/c/.timemachine ReadyNAS cnidscheme:dbd allow:ReadyNAS options:tm
If you look in the Netatalk config you'll see e.g.
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MDGM-NAS:~# cat /etc/netatalk/AppleVolumes.default
~
"/backup" "backup" cnidscheme:dbd
"/media" "media" cnidscheme:dbd
To be able to backup to an ordinary share you need to add "options:tm" (no quotes) to the line for that share.
e.g. to allow TM backups to the backup share you'll need:
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"/backup" "backup" cnidscheme:dbd options:tm
Do note that editing settings for the share manually if done improperly would cause problems accessing your AFP shares and may even break at least some parts of Frontview. Use at own risk.
Edit: For the change to take effect don't forget to restart Netatalk either via Frontview, a command via SSH (simplest if you're using SSH rather than a config backup restore to do the config change. The SSH command is mentioned in a post below) or a reboot.
Edited: Tried to clarify some of the above. Please also see Skywalker's post below. Please update to 4.1.8+ (Sparc) or 4.2.19+ (x86) before attempting this fix.

