I have a big problem with Restoring a Project. Need urgent help please

Hi,
I have a project which after every few days or modifications, I do a backup and the backups are named as follows:
sc9_bkp_Project_20200823-151750
sc9_bkp_Project_20200827-181808
sc9_bkp_Project_20200831-142545
sc9_bkp_Project_20200929-035103
sc9_bkp_Project_20201001-114530
sc9_bkp_Project_20201023-011304

After I formatted my computer, I restored the latest one, but to my surprise, that was an older version! (with 120 Applications)
I tried another one, the same problem (again with 120 Applications)
All the backups have 120 applications. The previous backups I have deleted.

On my development server I have the system fully working, but the backups lacks several applications working on the development server.

Can anyone suggest why this is so?

What should I do to ensure that the backup is good and contains all the apps?

Thanks for answering.