Timemachine backups
I have a 2015 MBP. Timemachine gets about 1/2 complete on a backup then stops.
MacBook Pro 15″, macOS 12.7
Question marked as
Have you run Disk Utility's Disk First Aid on all connected drives?
In Disk Utility>View, select Show all Devices, highlight the top left entry.
Run Disk First Aid on all items in the left panel, from top down.
Are you running any VPN, Anti-Virus, or Cleaning apps?