I want if differential backup cannot be applied during off hours of reporting users.

I had similar sitiuation where we automated the whole process.

In a multiple instance server each instance needs to have different Port

In a Cluster the Instance must have same port reserved on all the nodes

This is what i did for a large database of 70G.B size for restoring it in UK DC. I took the backup of the database . I used winzip(do not...

This to too vague to understand what is the problem .Can you enable logging in SQL Server DTS package which ever is causing the problem.

This to too vague to understand what is the problem .Can you enable logging in SQL Server DTS package which ever is causing the problem.

How easy was it for you to do the export and import? How big was the database/s? Was is a very time consuming and tedious?

Trying to estimate the time and...

IS this virtual Server to Virtual server move or physical server to Physical server move. If it is physical to physical move i would suggest not going for it becase...

Use

DBCC SHRINKFILE with EMPTYFILE options

I have been through this before only thing, I was able to do in my case is export ,Make schema and collation changes and Load the data, apply constraints...

I means there is problem with SQL Server. Check SQL Error log located at root. Most .....MSSQL\Log