You set the retention rules....so, factor in size of clients server volumes, frequency of backups, and how much stow-age you're saving to. Adjust as necessary as time goes on. Get to be pretty granular there.
I'm not a master of the product, only used it in a fairly simple form. As most of our clients we have on Datto..which, basically runs on top of this, they just put their own interface on top of it..allowing us to set retention to keep hourly backups, and when to consolidate hourly into weekly, and when to consolidate weekly into monthly, etc etc.
But basically that Image Manager is what has the smarts...to have a "base image"..and then as it backs up allllllllllllllllllllll of those incrementals, it'll track them all so when you pick a time period to restore to, it knows what combination of base image plus incres...to roll together for you and present as a full snapshot of the time period you want. Pretty cool technology!