Check our article on Backup failures to understand possible causes and action recommendations.
Missing a differential backup may cause a loss of data. In the case of database fault, we won’t be able to restore the database.
A Differential backup contains all the data in a specific database or set of file groups or files since the last Full backup.
A Differential backup cannot be executed without Full backup, but it is smaller and faster to create than the base of a full backup, and it also requires less disk space to store backup images
Differential SQL backup should execute successfully every 24 hours.