Mac creates a save every hour, quickly filling the external drive. The "delete unnecessary files in Trash" does not work.

How to make the Mac do save at certain intervals?
Why would I want five saves the day?
I try to delete unnecessary files to free up space.
Trash on the Mac has become very slow, the removal process was take hours.
Then the process of removing all stops.
Why files are not removed through the trash?
What could be causing the removal process?

TimeMachine is designed to back up every hour. It saves only the files that have changed during the hour. After 24 hours TimeMachine culls the (up to) 24 backups to make a single backup for the day. After 30 days it takes the 7 oldest day backups and culls them into a single week backup.
You should never manually touch files in the TimeMachine backup. It doesn't like that. The best practice for TimeMachine is to devote an external drive to TimeMachine and nothing else. Because TM backups are incremental, it is recommended that your TM hard drive be 2-4 times larger than the amount of drive space your computer is using. In other words, if your 1TB hard drive is 1/4 full (250GB in use) you should have a TM drive between 500GB and 1TB depending on how much more data you expect to add to your drive and how long you wish to keep old back files.
Having said all this, you might prefer using some other program for backups. CarbonCopyCloner and ChronoSync are two programs you might want to look at.

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