BackUp Error

Hi,
I keep getting the following error when trying to do a backup.

2011-07-19 20:42.45: 1. Try for make a list of files to Backup ....
2011-07-19 20:43.10: Files to Backup: 4317
2011-07-19 20:43.10: Size of all Files: 61.01 MB
2011-07-19 20:43.10: 1. Try to create backup zip file...
2011-07-19 20:43.56: [ERROR]Maximum execution time of 50 seconds exceeded
2011-07-19 20:43.56: 1. Script stop! Will started again now!
2011-07-19 20:43.56: 2. Try to create backup zip file...
2011-07-19 20:43.56: Backup zip file create done!
2011-07-19 20:43.56: [WARNING] filesize(): stat failed for /customers/5/5/d/freefullvideosonline.com/tmp/.backwpup_c13007559ac0f850/backwpup_2_2011-07-19_21-42-44.zip
2011-07-19 20:43.56: Job done in 72 sec.
2011-07-19 20:43.57: Job done in 73 sec.