-snip-
Out of curiosity... where did Electrum export your wallet backup to? Or were you using a copy of the 'actual' wallet file that you exported from the protected app folder using 'root' permissions?
Should be in your internal storage (
not root), inside a folder named "
org.electrum.electrum".
There'll be no notification but an in-app message near the center of Electrum saying "
Backup saved" followed by the backup directory.