TimeMachineEditor is a software for macOS that starts backups in Time Machine at particular times. You can choose an interval or create other types of scheduling (see the screenshots below).

This is useful if you don’t need to backup every hour and don’t want the performance penalty. For example you might be frequently creating or modifying files which would cause long-running backup operations throughout the day.

1. List available local snapshots

First of all, you need to find out how many local snapshots exist in your local SSD. To do so, you need to execute the following command:

sudo tmutil listlocalsnapshots /Volumes/

2. Delete local snapshots

Next, you need to manually delete each local snapshot based in there <snapshot_date>.

sudo tmutil deletelocalsnapshots 2017-10-20-002004