I am trying to use the data loader to copy Salesforce backup (scheduled job) to Salesforce Sandbox. Now I know the user Ids would be different and it may result in errors. Hence would it make sense for me to possibly remove all users from the Sandbox, add the users that are currently in Production org to Salesforce Sandbox then use the data loader to insert the accounts and opportunities.
Help would be immensely appreciated.
Best Answer
If you're looking to copy data from your production org to sandbox, I would suggest using an app like SFXOrgData (http://www.sfApex.com) to accomplish this. I developed this app specifically for this purpose. It lets you select your Account records, and will automatically detect the associated opportunity records and the copies this records into the sandbox.
For the User records, sfdcfox is correct, the record Id's will match between production and sandbox.