As far as I can tel, it works by taking everything in /backup/* and adding that to a single tar.gz file.
My use case is as follows:
I run this in docker-compose separately from the running containers.
All my containers data dirs are located in lets say: /docker-volumes/app1 /docker-volumes/app2 etc.
I have grouped them by schedule for backups, eg. nightly, weekly etc. and have an instance of docker-volume-backup running per schedule, mapping the relevant volumes to them.
I've gotten the label feature to work brilliantly stopping all the "nightly" ones at night, backing them up, then starting them back up.
I can't seem to figure out an easy way to have this do the backups "one by one".
What I would like to see is an option to have every dir in /backup/* be treated as a single backup so that I could have
App1, App2, App3 in separate tar.gz files instead of a single tar.gz with App1, App2, App3 inside.
Is the only alternative to run multiple of these containers?

Thanks for a great little container!