SFDMU Help CenterWhat are the limitations on data volume processing?
No, there are no special limitations for this.
Basically, the plugin can process any number of records.
However, it's important to be aware that SFDMU is designed to transfer only small to medium data volumes to seed sandboxes or scratch orgs with limited demo data needed for developers. It is highly NOT recommended to use SFDMU for transferring entire large orgs.
When dealing with large data volumes, you may face various issues due to the API limits of the Salesforce environments and Node.js memory issues. There are no affordable out-of-the-box solutions for these issues.
If you are facing such issues, try:
Optimizing queries in the export.json file.
For Node.js memory issues, see: I have an JavaScript heap out of memory error. How to increase?
Also, refer to the related Salesforce documentation: API Request Limits and Allocations