Incremental Backups In SQL server
This is not true.

Transaction log backups are incremental, that is, they only store incremental changes since the previous transaction log backup.

You are confusing the differential log backup with "backups are not incremental", because differential backups only keep a record of the changes since the last full backup.

(Differential backups work in all recovery models, namely Simple, Bulk-Logged, and Full.)

If you want incremental backups, take transaction log backups regularly.