When using Salesforce website builder for data migration, first identify the specific data (Objects) to transfer, such as Accounts or Contacts. Create Excel templates for each Object, ensuring you follow the required order of migration due to object relationships (e.g., Users, Accounts, Opportunities). Populate these templates carefully, starting with one record to check accuracy. Prepare the destination organization by creating custom fields for legacy data, assigning "External ID" attributes when needed to maintain relationships. Finally, validate the data by creating custom reports to check record counts, spot-checking data, and reviewing exception reports to identify any missing or incorrect data.
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