Backup Incomplete

I need help and advice on best course of action for BackUpWordPress issues I am experiencing. I’ve taken on the task to help out a local charitable organization with their website but I am new to WordPress. One of the primary tasks is to upgrade the site to version WordPress 5.2 but the current backups are failing and before I upgrade I want to make sure I have a proper restorable backup. I also want to change the backup add-in to UpdraftPlus as soon as I am confident I have a good backup.

Here are the messages displayed on the Backup screen:

Zip: zip warning: No such file or directory
zip warning: No such file or directory

Mysqldump: Warning: Using a password on the command line interface can be insecure.
mysqldump: Got errno 122 on write

Daily backup:
——————-
Backup my database (18 MB) daily at 11:00 pm, store the last 3 backups in /wp-content/backupwordpress-e6d7e7511a-backups.

3 backups completed Size Type Actions
May 8, 2019 – 11:00 pm 1 MB Database Download | Delete
May 7, 2019 – 11:00 pm 1 MB Database Download | Delete
May 6, 2019 – 11:00 pm 1 MB Database Download | Delete

Weekly Backup:
—————–
Backup my database and files (928 MB) weekly on Sunday at 3:00 am, store the last 3 backups in /wp-content/backupwordpress-e6d7e7511a-backups.

3 backups completed Size Type Actions
May 5, 2019 – 3:00 am 1 MB Database and Files Download | Delete
April 28, 2019 – 3:00 am 1 MB Database and Files Download | Delete
April 21, 2019 – 3:01 am 883 MB Database and Files Download | Delete

Any advice and/or recommendations are highly appreciated.
Thanks
Tullio