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   backup-dir as String,
   backup-period as Number,
   days as String[],
   start-time as (Number|String),
   backup-security-db as Boolean,
   backup-schemas-db as Boolean,
   backup-triggers-db as Boolean,
   [include-replicas as Boolean],
   [incremental-dir as String?],
   [purge-journal-archive as Boolean?],
   [journal-archiving as Boolean],
   [journal-archive-path as String],
   [lag-limit as (Number|String)]
) as element(db.databaseBackup)


This function constructs a weekly scheduled incremental backup specification.

backup-dir The directory where the full backup is located.
backup-period How many weeks between each backup.
days The day(s) of the week. Must be a sequence of zero or more of monday, tuesday, wednesday, thursday, friday, saturday, sunday.
start-time A time for the scheduled incremental backup to start.
backup-security-db Whether to backup the security database alongside the current incremental backup.
backup-schemas-db Whether to backup the schemas database alongside the current incremental backup.
backup-triggers-db Whether to backup the triggers database alongside the current incremental backup.
include-replicas If set to false, do not include the replicas in the incremental backup. The default is true, which means to include all replicas in the incremental backup.
incremental-dir The directory in which to save the incremental backup.
purge-journal-archive Whether or not to purge journal archive after incremental backup is performed. Defaults to false
journal-archiving Whether or not to enable journal archiving. Defaults to false.
journal-archive-path Path for where archived journals are stored. Defaults to the backup data directory.
lag-limit Maximum difference in seconds that the archived journal can lag behind its forest's active journal. Defaults to 900.


const admin = require('/MarkLogic/admin.xqy');
 admin.databaseWeeklyIncrementalBackup("/backupDir", 2, "thursday",

   //returns the weekly incremental backup specification 

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