Site Conversion Time Saving Tip
Take your images folder from the old site for example and copy it to the sites CMSImports folder. Once completed, then login to the Site Manager of your site and go to [Settings], choose the [Site] or [Global] and then add these extensions as you see fit (I sometimes also add .PDF or .JS as well):
Settings -> Global -> URLs and SEO:
Save and then go to CMSDesk -> Tools -> File Import
You should see a list of files and folders there. When you import these to your site in a folder (I make and use an 'assets' folder or make a folder named as it was in my old sites path). Kentico CMS will still rename the files extension to .aspx, however, because you added the settings above, you can also call the file as the original file name. Now both image.aspx or image.jpg will work for the same image.
site without cleaning up all the references.
So, when dealing with the bulk import of many files, and you don't want to clean all the references... this works quite well. As my example below was filly imported from a spidered site:
If you have any other time saver tips or suggestions feel free to email or comment below.