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title: "On-premises to cloud ServiceNow migrations"
canonical: "https://docs.perspectium.com/space/resources/1114750/On-premises%20to%20cloud%20ServiceNow%20migrations"
format: markdown
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An  on-prem to cloud  ServiceNow migration  involves syncing data from an on-premises ServiceNow instance with a cloud instance or vice-versa. Perspectium Replicator for ServiceNow is the recommended tool for completing an on-premises to cloud migration. To learn more about Replicator, see  Replicator for ServiceNow . Operating assumptions A typical use case of syncing data from an on-premises instance to a cloud instance or vice-versa assumes: Typical ServiceNow-to-ServiceNow replication rate is in the range of 200 records per second or 17 million records per 24 hours. This rate is affected by networking and instance resource. Replication of data will occur over weekends and holidays, so day estimation includes these days. Phase 2 catch up (delta) replication should not last more than a few hours and therefore should be calculated to be less than 1 million records based on cut-off date. Planning for your migration In advance of your on-prem to cloud migration, you will need to:   Determine the  scope of data  to be migrated and the tables to be migrated   Determine how to  group your data  for the migration   NOTE :  A typical approach is to group tables that are transactional or non-transactional in nature.  Transaction tables will consistently receive inserts, updates, and deletes. Some typical examples of transaction tables are the  Incident  and  Task  tables. Non-transaction (or foundation) tables contain data that is not frequently in flux. Some typical examples of non-transaction tables are the  U ser ,  Location , and  Catalog Item  tables.   Resolve and/or map any  data structure differences  between your source and target instances   Determine an appropriate  historical start date  for the scope of data to be migrated   Calculate a  cut-off date  for Phase 1 of the migration   Determine  schedule for group shares  so that no conflicts with shares occur Migration Phase 1  Replicate approximately 100 GB of data up to your calculated cut-off date  Approximately 1-15 days For  Phase 1  of your on-prem to cloud migration: Migration Phase 2  Replicate data from your Phase 1 cut-off date to current Approximately 1-2 days     NOTE :  Multiple Phase 2 activities may need to be executed to achieve this duration. For  Phase 2  of your on-prem to cloud migration: For more information or to request an on-prem to cloud migration for your organization, contact  Perspectium Support . Similar topics Contact Perspectium Support US:  1 888 620 8880 UK:  44 208 068 5953 support@perspectium.com