Well, there are caveats. First of all, the old backup you made and the current one you're making - are they from the same ROM? If not, are they from the same base? meaning, if they are different ROMs, but both based upon ERE25 or ESE53, etc. then you should not have that big of a problem restoring your data.
Second, I don't believe that you need to wipe anything, a simple restore over your current install should be fine (of course, referring again to the above caveats).
If you really want to make your life simple, though, if you need to get the docs off and / or transfer them or whatever, make your backup, wipe, restore your entire old backup, grab your docs to your Mac, then wipe and restore your new backup - then you won't have to worry about incompatibilities between ROMs and what not.
Of course, this assumes that your old backup was a full backup as well....
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