NOTE: It's a good idea to create backer groups before importing backers. Read about how to create groups here.
Mark them as "Other" if you don't want to mark them as original backers.
Importing backers - how to create an import file
You can download the example file to see what the list should look like to avoid any problems when importing. The Excel file has to include the following:
Backer name (required) - should be the full name of the backer, it should not have any numbers or special characters ($, %, ^, etc.)
E-mail (required) - the e-mail of the user, all users will get a "welcome to project" e-mail once imported
Pledge amount (required) - the amount pledged to the project; with currency symbol or ISO code
Group - the name of the group the backer should be placed in; if you leave this empty, the backer will be imported to the "default" group