I dug through my old IRC logs, here are my notes regarding the backup transport issues.

1) This is the commit that TeamEOS did to enable the Google transport:

https://review.teameos.org/#/c/263/

2) It also involved using an older (at the time) version of Gapps. Not sure if that'd still be the case with recent gapps, an older version of GoogleTransport.apk was needed at the time.

3) The following adb commands are helpful in troubleshooting this. To view the currently registered transports:

Code:
adb shell bmgr list transports
It will return a list of registered transports (and which one is currently selected), looking like this:

Code:
* com.google.android.backup/.BackupTransportService
android/com.android.internal.backup.LocalTransport
.BackupTransportService is the one you want (that stores in Google's cloud). The LocalTransport one will only store in /cache.

You can select which transport to use, by using this:

Code:
adb shell bmgr transport com.google.android.backup/.BackupTransportService
Hoping it helps folks through this issue I no longer have the custom partition and Everlov build on my phone (I use it for work, so I can't afford to run beta firmwares on it), but I'm sure with these info the devs will be able to look further into it.