I tried looking for a replacement app for that last year or so, but didn't find anything really satisfactory, either. Didn't try OAndBackupX, though, because my phone's currently too old, but "the results are not great" doesn't sound very encouraging, I guess :-)

So while it's a bit clunky, for now I'm relying on a combination of Titanium Backup (at least on my phone it's still working fine except for split APKs) + SAI to do an extra backup of split APKs.