I imagine that some of the 2019 snapshots below are redundant.

Can I safely destroy any of them?

$ zfs list -t snapshot
NAME                                                     USED AVAIL  REFER  MOUNTPOINT
copperbowl/ROOT/Waterfox@2020-03-20-06:19:45            67.0M -  59.2G  -
copperbowl/ROOT/r359249b@2019-08-18-04:04:53            5.82G -  40.9G  -
copperbowl/ROOT/r359249b@2019-08-18-11:28:31            4.32G -  40.7G  -
copperbowl/ROOT/r359249b@2019-09-13-18:45:27-0          9.43G -  43.4G  -
copperbowl/ROOT/r359249b@2019-09-19-20:03:26            5.13G -  43.3G  -
copperbowl/ROOT/r359249b@2019-09-24-20:45:59-0          7.67G -  44.6G  -
copperbowl/ROOT/r359249b@2020-01-09-17:05:57-0          7.66G -  55.2G  -
copperbowl/ROOT/r359249b@2020-01-11-14:15:47            7.41G -  56.2G  -
copperbowl/ROOT/r359249b@2020-03-17-21:57:17            12.0G -  59.2G  -
copperbowl/iocage/releases/12.0-RELEASE/root@jbrowsers     8K -  1.24G  -
copperbowl/poudriere/jails/head@clean                    328K -  1.89G  -
$ beadm list
BE       Active Mountpoint  Space Created
Waterfox -      -           12.2G 2020-03-10 18:24
r357746f -      -            1.3G 2020-03-20 06:19
r359249b NR     /          148.9G 2020-03-28 01:19
$ beadm list -aDs
BE/Dataset/Snapshot                              Active Mountpoint  Space Created

Waterfox
  copperbowl/ROOT/Waterfox                       -      - 137.0M 2020-03-10 18:24     r359249b@2020-03-17-21:57:17                 - -           59.2G 2020-03-17 21:57   copperbowl/ROOT/Waterfox@2020-03-20-06:19:45   - -           67.0M 2020-03-20 06:19

r357746f
  copperbowl/ROOT/r357746f                       - -            1.2G 2020-03-20 06:19     Waterfox@2020-03-20-06:19:45                 - -           59.2G 2020-03-20 06:19

r359249b
  copperbowl/ROOT/r359249b@2019-08-18-04:04:53   - -            5.8G 2019-08-18 04:04   copperbowl/ROOT/r359249b@2019-08-18-11:28:31   - -            4.3G 2019-08-18 11:28   copperbowl/ROOT/r359249b@2019-09-13-18:45:27-0 - -            9.4G 2019-09-13 18:45   copperbowl/ROOT/r359249b@2019-09-19-20:03:26   - -            5.1G 2019-09-19 20:03   copperbowl/ROOT/r359249b@2019-09-24-20:45:59-0 - -            7.7G 2019-09-24 20:45   copperbowl/ROOT/r359249b@2020-01-09-17:05:57-0 - -            7.7G 2020-01-09 17:05   copperbowl/ROOT/r359249b@2020-01-11-14:15:47   - -            7.4G 2020-01-11 14:15   copperbowl/ROOT/r359249b@2020-03-17-21:57:17   - -           12.0G 2020-03-17 21:57   copperbowl/ROOT/r359249b                       NR /           59.0G 2020-03-28 01:19
$

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