What Happens to Data When a User Account Is Deleted?
If you delete a user account, data associated with that account is also deleted.
You cannot undo delete or restore the deleted accounts or its data.
For details on data that will be deleted, refer to pages for each service.
kintone
kintoneHelp: When a user is deleted, is the data related to the user also deleted?
Garoon
Garoon Help: Data Processing for Deleted Users
If the data can be imported or exported, you can get the backup before deleting the accounts.
For details, refer to the following page:
Garoon Help: File List for Importing/Exporting