Snapshots should be allow to easily go back in time.
As such, the following is offered by Solaris/OpenIndiana Time Slider:
| **Name** | **Snapshot every** | **How many we kept?** |
| frequent | 15 mins | 4 (=one hour) |
| hourly | hour | 24 (=one day) |
| daily | day | 31 (=one month) |
| weekly | week | 7 (=two months) |
| monthly | month | 12 (=a year) |
It would be a nice idea to implement this on Ysul.