We are taking automatic backups every day, using Python scripts.
Backup is done successfully every day. But that backup is not showing on SYS.SNAPSHOTS.
Any other way we can get to know that, backup is done using query in Cratedb.
When you query
sys.snapshots CrateDB actually checks the repository, so if a snapshot is not listed there may be a problem with the repository.
I would advise you try to restore one of these snapshots and try taking snapshots against a new repository.
We check that one.