Many thanks for your step by step instruction... I think I will follow it to "upgrade/migrate" mine during the weekend (once ... i THINK im ready).
May I know after the migration, all your existing data can be retrieved, right?
Also, on your step 4 "Go to Control Panel /Update & Restore and update to DSM 6.1.3-15152", is that mean you don't need to download the file "DSM_DS3615xs_15047.pat" from the first page???
Thanks again.