Make Backup & Migrate backups smaller in size
Backup &amp; Migrate module by default backs up all the data that is in your database. That includes cache_%, watchdog, and other tables data that is not essential for a backup. By excluding data that lives in those tables from your backup (Advanced Backup settings) you can save a great deal of MB.
Read more about tables recommended for exclusion here -Backup and Migrate exclusion recommendations?.