I'm having the same problem with Time Machine on my 2015 MBP. It was ok'ish up until a few weeks ago, I back up to a HDD via an Airport Extreme, TM backups used to be hourly and circa 60mb. Now they are 300-600mb and take hours.
TM seems to just hang, the process is: Preparing Backup, Backing Up, then as if that didn't take long enough there is a Verifying Backup stage that can take forever. As an example on Wednesday the system only showed one successful backup over the whole day. My MBP setup is very basic, I have the 128GB model with MS Office installed, I use it all day for work, connected to AC. I only use Outlook, Safari and Excel with small spreadsheets.
I also have a 2012 Mac Mini, again basic spec, connected to the same network as my MBP, the TM backups are of a similar size but they backup up in minutes, no hangs or delays. I can't work out why that would be the case....
Very frustrating as it's a good feature.
TM seems to just hang, the process is: Preparing Backup, Backing Up, then as if that didn't take long enough there is a Verifying Backup stage that can take forever. As an example on Wednesday the system only showed one successful backup over the whole day. My MBP setup is very basic, I have the 128GB model with MS Office installed, I use it all day for work, connected to AC. I only use Outlook, Safari and Excel with small spreadsheets.
I also have a 2012 Mac Mini, again basic spec, connected to the same network as my MBP, the TM backups are of a similar size but they backup up in minutes, no hangs or delays. I can't work out why that would be the case....
Very frustrating as it's a good feature.