Features of the extension

• Export single site from the network
• Export multiple sites from the network
• Export the whole network
• Import single site into the network
• Import multiple sites into the network
• Import a network
• Clone single site within a network
• Multi-network support
• Use on any number of websites that you own
• Unlimited Extension included
• WP CLI commands included
• Premium support

https://servmask.com/products/multisite-extension?locale=en

Probably you will need also All in One Wp Migration Unlimited Extension

Changelog

v4.37 07/04/2024

Added:
Added New hooks during the export and import processes to allow for custom actions and integrations.

4.35 04/29/2024 Added:

Added WP-CLI Support for Reset Hub.

4.34	03/12/2024	Fixed:

Fixed scheduler set month day when interval is monthly

4.33	03/06/2024	Added:

Reset Hub Page: Introducing a new reset hub page, providing users with powerful reset tools for efficient site management. This feature allows for easier resets of WordPress environments, facilitating smoother development and testing workflows.

4.32 10/17/2023

Support for WordPress 6.4

4.31 08/23/2023

Allow WP CLI users to --exclude-tables non interactively.
Add support for cloud storage providers in the scheduler.
Create default jobs in the backup scheduler.
Add list of subsites in Backup scheduler.
Retention settings in the Backup scheduler.

4.30 06/26/2023 

Added Flexible Backup Scheduler.
Removed the [beta] label from advanced settings.

4.29 05/23/2023 Changed:

Removed TrustPilot Widget

4.28 05/02/2023 Fixed:

Improved WP-CLI Support