If you want to try to reduce the total amount of quota being used by your servers for backups you can try these methods to do so.
Note: This does not guarantee that you will reduce your total used quota, the methods described are suggestions and each case is unique.
Editing policies to use file excludes
To setup the exclusion of files you would navigate to the Advanced Excludes tab and enter the regular expression that you would like to filter for (such as *.log) and then click on Add. Once it has been added, click Save at the bottom left to ensure that it is kept.
For folder excludes you would use the File Excludes tab and simply select the folder you would want to exclude and click Save.