Voice memos is awesome, but they can not be sent to your own server.
My Dictation System allows you to save any dictations on the device, but you can also enter a URL and upload the recordings to an external destination, ie not iCloud, but your own server.
Parameters can be added to the URL as needed to additionally tag the audio as needed. A sample PHP upload script is viewable in the app as an example.
Dictations can be automatically deleted after the number of days you specify on the Settings page.