Upon completing automatic (by Time Machine) and manual backup (by files transfer to Passport external drive), I upgraded my MacBook Pro operating system from Leopard (10.5) to Snow Leopard (10.6)

snow_leopard

All survived the clean install (erase & install) upgrade:

  1. apps
  2. bookmarks
  3. music
  4. photos
  5. e-mail

Only mailboxes screwed up a little. All play counts in iTunes are reset to nil and the ratings have gone too. Otherwise, everything else is fluid!