Ttree_Oembed_Resource_Cache:
  frontend: TYPO3\Flow\Cache\Frontend\VariableFrontend
  backend: TYPO3\Flow\Cache\Backend\MemcachedBackend
  backendOptions:
    defaultLifetime: 3600
    servers: [ "127.0.0.1:11211" ]

Ttree_Oembed_EndPoint_Cache:
  frontend: TYPO3\Flow\Cache\Frontend\StringFrontend
  backend: TYPO3\Flow\Cache\Backend\MemcachedBackend
  backendOptions:
    defaultLifetime: 3600
    servers: [ "127.0.0.1:11211" ]
Ttree_Oembed_Resource_Cache:
  frontend: TYPO3\Flow\Cache\Frontend\VariableFrontend
  backend: TYPO3\Flow\Cache\Backend\SimpleFileBackend

Ttree_Oembed_EndPoint_Cache:
  frontend: TYPO3\Flow\Cache\Frontend\StringFrontend
  backend: TYPO3\Flow\Cache\Backend\SimpleFileBackend

Change default cache backend to File
[TASK] Change default cache backend to File

In Production the SimpleFileBackend is the new default to avoid breaking if this package is installed on machines that do not provide Memcached.