The problem with all the proxmox cron / backup stuff is, that these solutions do not consider snapshots are fast, reliable, sendable and do not take up much disk space, as long as the fs has not changed too much.
So zfs-auto-snapshot is performing a snapshot every 5 minutes for an hour, every hour for a day, etc. And it auto-removes these snapshots after one "round" of snapshotting, so it should not take too much space in the long term. This is absolutely amazing, because data loss is pretty unlikely to happen and you can always free up space by removing snapshots manually. I still have backups on an external disk though :-)
So zfs-auto-snapshot is performing a snapshot every 5 minutes for an hour, every hour for a day, etc. And it auto-removes these snapshots after one "round" of snapshotting, so it should not take too much space in the long term. This is absolutely amazing, because data loss is pretty unlikely to happen and you can always free up space by removing snapshots manually. I still have backups on an external disk though :-)