It is data can import from manager free to manager cloud

before this i use my manager as a free. if i use my manager cloud… it is can import my data before this

All versions are interchangeable, ie fully compatible.

how to keep data from manager to manager cloud?

Just press backup to save .manager files on your PC.

After that can import in manager cloud?

You can import the backup business file to any edition of Manager (Cloud, Server, Desktop) as long as the version (20.8.xx or whatever) is at a version as high or higher than the version you used to make the backup

Yes. Just select to import the existing Business. As @Joe91 correctly said you cannot open a newer version of the files with an older version of Manager.

Read the Guide: https://www.manager.io/guides/8890.