Only 4 time machine backups despite adequate memory, any suggestions?

My Cloud OS 3 Personal & Network Attached Storage My Cloud Mirror
1

I’m using Time Machine to backup to a share on my WD Mirror. It’s using only 1.4 out of an allocated 3.89TB. For some reason, there are only ever a total of 4 backups when I enter Time Machine. They’re always today’s and a few from the day before.
I did enable Mac backups on settings and allocated the maximum size from the beginning.

Any idea why this is happening? Thanks for any help on this.

2

During Auto Backup, sometimes backup process may go on pause or hold when computer goes into sleep mode. And if this happen after the next backup time arranged n Auto Backup, it will make a queue of uncompleted backup process.
I would suggest to close or stop those running backup and reconfigure time machine for new backup manually.