To speed up a migration with the data migration service, you can exclude some data from your legacy account.
Excluding dataBefore you begin
To access Data migration in the Google Admin console:
From the Admin console Home page, go to Data migration.
If you don't want to migrate old email or calendar events, specify a start date for the migration. The data migration service migrates email or calendar events from the start date entered to the current day, beginning with the most recently dated events or messages.
In the Migration Start Date section, choose an option to specify a start date:
- Select a given time period.
- Select Custom Date and choose the date of the earliest email or calendar event you want to migrate.
Note: You cannot set an end date to specify a date range, nor can you change the migration settings (including the start date) once the migration has started.
If you previously migrated data from a specific start date, and later decide you want to migrate data from an earlier start date, you must complete a full data migration using the earlier date. The data migration service automatically checks every message before migrating it, identifies duplicate messages, and eliminates them. It performs this check regardless of how the migration is run, or how the message was previously inserted the account.
If you don't want to migrate deleted mail or junk email, uncheck the following boxes in the Migration Options section:
- Migrate deleted email
- Migrate junk email
You might not need to move all folders in your migration. For example, the sent mail folder or your users' personal email folders.
To remove folders from a migration:
- Ensure the folder is a top-level folder (at the same level as the Inbox).
Tip: You can create more than one top-level folder.
- When you set up your migration, check the Exclude the following folders from the migration box.
- Specify the folders in a comma-separated list (for example, Sent Items, MyFolder).
Make sure the folder name in the list is identical to the name in your mail service (for example, capitalization and spacing match).
If you’re migrating from a G Suite account and you don't want to migrate specific Gmail labels:
- Check the Exclude the following folders from the migration box.
- Specify the labels in a comma-separated list (for example, Sent Items, MyFolder, All Mail).
Important: You must also add All Mail to the comma-separated list. If you don't, messages containing the excluded label that also have the All Mail label are migrated.
Note: Only the first folder level can be excluded but all child folders from an excluded label are also excluded. For example, if the excluded folder list is "MyFolder, Sent Mail", "MyFolder" is excluded, as is the folder "MyFolder/MySubFolder". The same occurs for the folder "[Gmail]/Sent Mail". However, if you set the excluded folder list to explicitly include both the parent and child folder ("MyFolder/MySubFolder") neither is excluded because "MyFolder/MySubFolder" is not within the first folder level in the label hierarchy. There's currently no way to exclude named subfolders.
If you’re migrating calendar events and you don't want to migrate secondary calendars, uncheck the Migrate secondary calendars box.