Every so often, I will delete the zipped backups in the backup folder except for the last three or four. The way do determing this is to sort the backups by date, newest first. It looks to me like your backup folder is in the same master folder with your other Lightroom Classic files, including the catalog. This is a very risky situation. If that drive fails, you will loose your catalog and all the backups. To avoid that, get an external drive or two for the backups and your photo files. If you already have external drive(s), when you quit Lightroom Classic, there is a place to designate one of the external drives as the location for the backups.
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