Most users will not need to change this, but documenting it helps
preserve the interface.
Default: For compatibility with older configurations, the value of
database.path is used if **database.mail\_root** is unset.
Default: For compatibility with older configurations, the value of
database.path is used if **database.mail\_root** is unset.
+**database.backup_dir**
+ Directory to store tag dumps when upgrading database.
+
+ History: this configuration value was introduced in notmuch 0.32.
+
+ Default: A sibling directory of the Xapian database called
+ `backups`.
+
**database.hook_dir**
Directory containing hooks run by notmuch commands. See
**database.hook_dir**
Directory containing hooks run by notmuch commands. See