Hi @Tran Nguyen Khang ,
Per my understanding, the need now is to store files in SharePoint Online instead of File share servers and the answer is yes. However pay attention to the storage space you buy. You could check your plan to make sure you have enough space.
Please refer to this official document for more information about limits:
SharePoint limits
In addition, SPO is not only a storage site for document storage, but also many other functions, users can manage files well using SPO.
Here are a series of articles about SharePoint Online you could have a look:
Introduction to SharePoint in Microsoft 365
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