Backup to nextcloud is done too often and does not purge automatically old saves

[nephros]

Also reported here:

Backup runs every 20 minutes instead of once a day

REPRODUCIBILITY: OS VERSION: 4.4.0.64 HARDWARE: XA2, 10 III UI LANGUAGE: german REGRESSION: DESCRIPTION: Automatic Backup runs every 20 minutes, but system settings are set to once a day. PRECONDITIONS: Use Nextcloud as Backup target. STEPS TO REPRODUCE: Enable Backup, daily at 0:00. Wait. EXPECTED RESULT: Phone should make one Backup a day at the estimated time (or if not possible next time it has internet connection) ACTUAL RESULT: Backup runs every 20 minutes. Notification abou…