[Google Pixel 2 XL Guides, News, & Discussion] iSingle:
It said: Backup Manager currently enabled.

Here are the logcat when I switched to a new google account and bmrg backupnow --all

02-14 21:08:21.545 27537 27550 I Backup : [GmsBackupTransport] Starting new backup session
02-14 21:08:23.333 27537 5100 I Backup : [BackupHttpRequestUtil] Http Response Code: 200
02-14 21:08:23.352 27537 5100 W Backup : [BackupTransportCS] Server returned error, invalidating auth token. This is retried once.
02-14 21:08:23.352 27537 5100 W Backup : [BackupTransportCS] Network error: proposed backoff of 315000ms considered too large, not retrying. Exception that caused this: ljx: Server failed authorization.

I use a USA vpn connect from China, all google services work normally, so I don't assume it was a networks issue.

I will try to factory reset later.

---------- Post added at 03:14 PM ---------- Previous post was at 02:15 PM ----------

I did a factory reset.

here is the logcat after enable backup.

02-14 21:38:16.085 7259 13341 I Backup : [GmsBackupAccountManager] Backup account not found in gmscore.
02-14 21:38:16.245 7259 13341 I Backup : [GmsBackupAccountManager] Backup account not found in gmscore.
02-14 21:38:23.854 7259 13342 I Backup : [GmsBackupAccountManager] Backup account not found in gmscore.
02-14 21:38:23.953 7259 13342 I Backup : [GmsBackupAccountManager] Backup account not found in gmscore.
02-14 21:38:31.048 7259 8049 I Backup : [GmsBackupAccountManager] Backup account not found in gmscore.
02-14 21:38:31.068 7259 13657 I Backup : [BackupAccountNotifier] Showing notification.
02-14 21:39:17.185 7259 8034 I Backup : [GmsBackupTransport] Http Response Code: 200
02-14 21:39:18.774 7259 7553 I Backup : [GmsBackupTransport] Http Response Code: 200
02-14 21:50:10.541 7259 8030 I Backup : [GmsBackupTransport] Http Response Code: 200

All items except contacts were "waiting for backup". No "backup now" button !

update:

After google play updated play services, backup now button is back, and grayed just like before.

continue logcat:

02-14 22:10:31.859 20373 20389 I Backup : [BackupHttpRequestUtil] Http Response Code: 200
02-14 22:11:36.341 20373 21359 I Backup : [CallLogFlagSetter] Whitelisted for call log backup; backup_enabled flag already enabled.
02-14 22:11:39.976 20373 21367 I Backup : [TargetEnabler] Setting target components to enabled = false
02-14 22:11:40.008 20373 21367 I Backup : [TargetEnabler] Enabling D2dMigrateHelperService on non-Pixel on P+
02-14 22:11:40.048 20373 21367 I Backup : [SourceEnabler] Setting source components to enabled = true
02-14 22:11:40.054 20373 21367 W Backup : [ComponentEnablerUtil] Unable to set component 'com.google.android.gms.backup.component.CloudRestoreFlowActivity' to enabled=true
02-14 22:11:40.056 20373 21367 W Backup : [ComponentEnablerUtil] Unable to set component 'com.google.android.gms.backup.component.RestoreSessionV0Service' to enabled=true
02-14 22:11:40.059 20373 21367 W Backup : [ComponentEnablerUtil] Unable to set component 'com.google.android.gms.backup.component.D2dMigrateFlowActivity' to enabled=false
02-14 22:11:40.060 20373 21367 W Backup : [ComponentEnablerUtil] Unable to set component 'com.google.android.gms.backup.component.UsbDeviceAttachedActivity' to enabled=false