FreePBX Backup & Restore backup freezes at "Add items"

I am running PIAF with FreePBX 2.11 and trying to do a backup

My FreePBX Backup & Restore is

It will freeze at the “Adding items” like the following, and CPU is pecked by php like at 90% to 100% but nothing happens.

Saving Backup 5…done!
Intializing Backup 5
Backup Lock acquired!
Running pre-backup hooks…
Adding items…

Can anybody help please?