Yeah it feels it can be risky to "make the backup also dump the databases, and give it full filesystem permissions on our Docker volumes", depending on what binaries get the root privileges.
What I do is having a minimal systemd timer under root that only calls restic for backing up files (with some additional systemd seucurity restrictions). App-dependent backup logics, like dumping databases, are done by user/container-level cronjobs separately.
What I do is having a minimal systemd timer under root that only calls restic for backing up files (with some additional systemd seucurity restrictions). App-dependent backup logics, like dumping databases, are done by user/container-level cronjobs separately.