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TimeTracker is a great utility that will let you browse through your TM backups and see what's changed. If you find something big that's changing a lot, you can go into the settings as people suggest and exclude that. Pinpointing what it is will help you target the exclusion more precisely.



Don't mind the "extremely early state" stuff -- I've been using this for easily 10 years if not more and it's always been "prerelease" LOL. It works fine, but give it a while on first launch to scan through stuff.
this is a wrapper around tmutil I assume
 
I wanted to try CCC but its website said that a network NAS backup is not recommended. I invested in an expensive 6TB NAS a last year or earlier (I don't remember when) to use for my Time Machine backups for my Macs. If I use CCC the money I spent on the NAS will be waisted. Is CCC not usable with a NAS?
Time Machine backup to NAS is much more reliable now, using APFS
 
I had to buy a new external drive for TM backup. It is only USB 2.0 but I formatted as APFS and it is so much faster it surprised me. It also un-mounts so much faster. Much better
 
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