Crontab Command in Linux

OS: RH 6.8

Question: I have 2 crontab jobs on my Linux Server. 1 runs backups, 1 deletes older backups files. Following is the crontab job that deletes backups.  I am confused about + 2 number.  Can you explain it to me what does it means?

I want to keep 7 days of backups. Should I change it from 2 to 7 ?  Thank you for your help and time.

35 03 * * 1 find /backups -type f -mtime +2 -exec rm -rf {} \;