Since space is a major concern, maybe have a look at borg and possibly something like borgmatic on top for easier configuration. Borg does deduplicated backups, so you could do even hourly ones if you wanted without too much extra space depending on how many you want to keep. You’d need to run a borg server wherever you want to store your backups so it’s not a simple rsync over ssh situation but that’s the price you pay for the extra niceties.