JIRA XML Backup fails

[Tesla_Zavr]

When creating an XML backup on the JIRA SOFTWARE 8.8.1 server, an error occurs:
java.lang.NoClassDefFoundError: javax/xml/bind/DatatypeConverter

The reason is clear: JIRA does not fully support BLOB datatype in AO
So it is written in this article: https://confluence.atlassian.com/jirakb/jira-xml-backup-fails-throws-java-lang-noclassdeffounderror-javax-xml-bind-datatypeconverter-895910465.html

Tables containing binary data is:
Table AO_878210CONTAINER Column ICON type image
Table AO_878210_KEY_ENCRYPTION_KEY Column KEKSALT type image
Table AO_878210_USER_PASSWORD Column SALT type image

The table data belongs to the Sesam - Password Manager for Jira plugin,
they can't be deleted or cleared because important password data is stored there.

Tell me this restriction "JIRA does not fully support BLOB datatype in AO" applies only to the JIRA 8.8 server?

Will the BLOB data backup work on the JIRA 8.5.4 server ?

Can I downgrade JIRA Software from version 8.8.1 to 8.5.4 ?

Are there alternative solutions to make both the plugin and JIRA backups work?

Thank you!

[Tesla_Zavr · Accepted solution]

As a short term solution our suggestions would be to perform the
following steps:
1. Create a Sesam backup and download the backup file
2. Delete the Sesam plugin and remove the Sesam database tables from the
Jira database
3. Perform the Jira backup
4. Re-add the Sesam Plugin and import the backup file.