Optional migration from Turris OS 3.x for advanced users

After the upgrade to v3.11.17, I was interested to migrate to 5.x.
When I checked the rollback to get familiar with Schnapps I noticed the post snapshot size was very small.
Is it normal? Only 92kb?

root@turris:~# schnapps list
    # | Type      | Size        | Date                        | Description
------+-----------+-------------+-----------------------------+------------------------------------
    1 | rollback  |     5.73MiB | 2016-11-22 04:58:09 +0000   | Rollback to snapshot factory
    5 | rollback  |    23.86MiB | 2016-11-23 22:26:48 +0000   | Rollback to snapshot 4
   10 | single    |    24.23MiB | 2016-11-25 21:21:05 -0800   | User created snapshot
  330 | pre       |    17.38MiB | 2020-03-12 08:38:11 -0700   | Automatic pre-update snapshot
  331 | post      |    13.11MiB | 2020-03-12 08:38:26 -0700   | Automatic post-update snapshot
  336 | pre       |    13.11MiB | 2020-04-07 15:42:31 -0700   | Automatic pre-update snapshot
  337 | post      |    13.12MiB | 2020-04-07 15:42:41 -0700   | Automatic post-update snapshot
  341 | time      |    13.67MiB | 2020-05-03 01:05:02 -0700   | Snapshot created by cron
  342 | pre       |    13.54MiB | 2020-05-04 12:58:20 -0700   | Automatic pre-update snapshot
  343 | post      |    13.53MiB | 2020-05-04 12:58:28 -0700   | Automatic post-update snapshot
  344 | time      |    14.12MiB | 2020-05-10 01:05:02 -0700   | Snapshot created by cron
  345 | pre       |    14.15MiB | 2020-05-14 00:19:50 -0700   | Automatic pre-update snapshot
  346 | post      |    13.34MiB | 2020-05-14 00:20:02 -0700   | Automatic post-update snapshot
  347 | time      |    14.07MiB | 2020-05-17 01:05:02 -0700   | Snapshot created by cron
  348 | time      |    14.28MiB | 2020-05-24 01:05:03 -0700   | Snapshot created by cron
  349 | time      |    13.72MiB | 2020-05-31 01:05:02 -0700   | Snapshot created by cron
  350 | pre       |    11.29MiB | 2020-06-04 04:57:45 -0700   | Automatic pre-update snapshot
  351 | post      |    92.00KiB | 2020-06-04 05:00:49 -0700   | Automatic post-update snapshot