This is a known issue
Backup task hangs at "Calculating time remaining..."
You create a large backup to a destination formatted in NTFS. Backup starts correctly, but hangs after making some progress.
A third-party application runs slowly if Acronis True Image is installed.
Only those applications are affected, whose executable files (.exe) do not have a valid digital signature, AND modify a lot of files in a small period of time as part of its normal work.
To check if an executable file has a valid digital signature or not, follow the steps below: