Originally Posted by djriful
I have to wipe/date/cache before flashing a new ROM? Mandatory?
Will this wipe out the data on my download folder or backups from Titanium?
It depends on what you're coming from but wiping data will certainly delete everything.
If you're coming from an earlier version of the same ROM, you can probably get away with wiping dalvik and cache, no user data will be deleted, it's more like a traditional upgrade.
If you're switching ROMs though, it's normally advisable to do a clean wipe to minimise the chance of any issues