FreePBX Backup Failing

Backup Failing on FreePBX with the following message whether I do a full backup with all modules or a partial with just a few modules. Any ideas how to fix? Server has 49GB memory allocated to it.

Allowed memory size of 536870912 bytes exhausted (tried to allocate 58720297 bytes) in /var/www/html/admin/modules/backup/Json/json_encode.php on line 5

Backup and Restore 15.0.10.68
Php ver 5.6
FreePBX 15.0.17.64

https://www.google.com/search?q=freepbx+Allowed+memory+size+of+536870912+bytes+exhausted+(tried+to+allocate+58720297+bytes)+in+%2Fvar%2Fwww%2Fhtml%2Fadmin%2Fmodules%2Fbackup%2FJson%2Fjson_encode.php+on+line+5&ei=AQnFYcfDDPOu0PEPxvCFsAY&ved=0ahUKEwiHyJqljPv0AhVzFzQIHUZ4AWYQ4dUDCA8&uact=5&oq=freepbx+Allowed+memory+size+of+536870912+bytes+exhausted+(tried+to+allocate+58720297+bytes)+in+%2Fvar%2Fwww%2Fhtml%2Fadmin%2Fmodules%2Fbackup%2FJson%2Fjson_encode.php+on+line+5&gs_lcp=Cgxnd3Mtd2l6LXNlcnAQA0oECEEYAEoECEYYAFAAWNMWYPEXaABwAngAgAEAiAEAkgEAmAEAoAEBwAEB&sclient=gws-wiz-serp

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