You need those only if you want to use Backupmenu without ubiboot.
Ubiboot uses a bit different approach.

However, if you really need those:

• The file "/sbin/preinit_harmattan" is same as the original "/sbin/preinit", so you can get it from the preinits.tar file.
• As for evtap, you can find it in many places, for example if you want to compile it yourself, the source is on my svn server: https://toosa.swagman.org/svn/sillykbd/TRUNK/evtap.c
  Compiled binary you can get from ubiboot rootfs for example: https://toosa.swagman.org/svn/animat.../usr/bin/evtap
  (that's tha latest, version 0.9.0, I am not sure which one you need as the command parameters have changed in different versions...)