You must do the Salesforce data migration before going live. Using migration process, all the existing data migration can be brought from your legacy system to the Salesforce Cloud without losing any of it. As the process of migration is a one-time activity, the migration task will be complete when data is loaded into the Salesforce org.
As we seamlessly migrate all your data to the Salesforce platform, there is no need to worry about losing your data. Migration of data also minimizes downtime and other negative factors that affect your business.