Do the following, if you want to back up individual disk/partitions or files/folders.
Impossible to create or save file backup plan with excessive amount of selected items.
Issue occurs in this scenario:
Issue in the product. The issue will be fixed in next releases of Acronis products.
Files/folders backup plan shows Individual files selected in Items to back up section, instead of showing paths to files.
This is by design behavior when more than one machine is included in the backup plan.