Cross the Cloud.
In case you were curious about the procedure to transfer your save files to Borderlands: The Handsome Collection on Xbox One and PlayStation 4 later this month, be curious no more! Your questions have finally been answered (we hope).
First things first- your saves from the Xbox 360, PlayStation 3, and PlayStation Vita versions are all compatible. However, only one save can be uploaded at a time (although you can repeat the process multiple times and get all your saves in the new collection that way).
Here is what you need to do:
There are a few restrictions- PlayStation family saves are compatible only with PlayStation family versions, and Xbox family saves with Xbox family versions. This means your Xbox 360 save does not upload to the PS4 Handsome Jack Collection.
If you do do this, your original save won’t be deleted either- just copied.