Thank you very much for the advise. I followed the instructions in the linked thread and was able to complete my upgrade.
Now that the upgrades are complete, I am wondering if the directories below /home/user-data/owncloud-backup/ need to be retained. On my system, there is 1.9G of file space that I might reclaim. Space is tight on this virtual private server.
root@box:~# ls -l /home/user-data/owncloud-backup/
total 32
drwxr-xr-x 2 root root 4096 Jun 19 2019 2019-06-19-10:11:24
drwxr-xr-x 3 root root 4096 Aug 12 2019 2019-08-12-15:53:18
drwxr-xr-x 3 root root 4096 Feb 20 2020 2020-02-20-06:03:04
drwxr-xr-x 3 root root 4096 Jun 13 2020 2020-06-13-10:50:20
drwxr-xr-x 3 root root 4096 Feb 1 09:10 2021-02-01-09:10:20
drwxr-xr-x 3 root root 4096 Feb 1 09:22 2021-02-01-09:21:59
drwxr-xr-x 3 root root 4096 Feb 1 09:30 2021-02-01-09:29:58
drwxr-xr-x 3 root root 4096 Feb 1 14:59 2021-02-01-14:59:17
root@box:~# du -hs /home/user-data/owncloud-backup/
1.9G /home/user-data/owncloud-backup/