You have a backup plan with retention rules. Retention task fails with:
Error: An unsupported URI is specified: 'F:\Acronis\#arl:/B0FA4D42-6C34-4261-9A13-00731960BE51/74695400-3457-465B-BA6A-6BE8FAC21BCF/96D11AB5-FF69-4B4C-9884-4BE8778AAECB'.
Issue in the product.
The issue is fixed in the latest build of the backup agent - 12.0.4492. Download it from backup console and update installation of backup client on affected machine.