XQuery: db:create-backup, compress vs. store

[ChristianGruen]

db:create-backup($db as xs:string, $options as map(*)) as empty-sequence()

Options:

• comment: add string comment
• compress: boolean for compressing or storing data. Storing is faster, but takes more space

Documentation: https://docs.basex.org/wiki/Database_Module#db:create-backup