Docker Backups not working

Question … have multiple instances of Xibo Docker installed on a Ubuntu 16.04 server. works perfect, no issues ( 1.8.x not 2.0 version yet ) … looking at the “backup” directory … only backups are from when did installs and upgrades - not daily.

How can fix this ? Want daily backups incase of anything happening to server ( drive corruption, power outage, etc )…

using custom ports & folders as well…
Thanks