read on.net forum--XML or recordset or database --Technical decision required-

I have to take a technical decision and I need help, please help me to decide. Let me tell you that I am working on VB.Net

I have a data entry application; its database is on network. All the day a Data entry operator enter the data in it and at some given point of time data entry operator will update this data to network, till then the data should be on local hard disk. Now this is I have to decide that in which form I would like to store the data in local hard disk. Should I save all the data as an XML file ,or should I make any disconnected record set or should I make a temporary database on the local computer and then I update it on the network but in this database case it would be difficult if I am using SQL Server incase if the local computer doest have MSDE. Please give me possibilities which are efficient . or just give me the idea that which one I choose from the above given choices

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sorry for posting here