How to limit disk space used by backup

Hello Everyone;

 

I am backing up two disk totalling ~ 350GB into a disk with 2TB of space. the backup disk fills up in about 3 weeks and the only way I can get backup to work is to wipe the disk clean and start backup again. Is there any way to limit total disk space used for back by allowing backup application to write over older files?

 

I think the main issue is temp files in various appdata application subfolder.

 

thanks;

Behruz...