Handbook - ports: Remove pkg backup from ports chapter

pkg backup command was remove in [1]

PR:                     271534
Submitted by:           Aaron Lopez <vieroninfo@gmail.com>

[1] https://github.com/freebsd/pkg/commit/eea1a990eb1187a408811534a5060e58074a9044

1 files changed, 0 insertions, 32 deletions

diff --git a/documentation/content/en/books/handbook/ports/_index.adoc b/documentation/content/en/books/handbook/ports/_index.adoc
index f8916d98c6..02be6d1168 100644
--- a/documentation/content/en/books/handbook/ports/_index.adoc
+++ b/documentation/content/en/books/handbook/ports/_index.adoc
@@ -559,38 +559,6 @@ Marking an installed package as _not_ automatic can be done using:
 # pkg set -A 0 devel/cmake
 ....
 
-[[pkgng-backup]]
-=== Restoring the Package Database
-
-Unlike the traditional package management system, pkg includes its own package database backup mechanism.
-This functionality is enabled by default.
-
-[TIP]
-====
-To disable the periodic script from backing up the package database, set `daily_backup_pkgdb_enable="NO"` in man:periodic.conf[5].
-====
-
-To restore the contents of a previous package database backup,
-run the following command replacing _/path/to/pkg.sql_ with the location of the backup:
-
-[source,shell]
-....
-# pkg backup -r /path/to/pkg.sql
-....
-
-[NOTE]
-====
-If restoring a backup taken by the periodic script, it must be decompressed prior to being restored.
-====
-
-To run a manual backup of the pkg database, run the following command,
-replacing _/path/to/pkg.sql_ with a suitable file name and location:
-
-[source,shell]
-....
-# pkg backup -d /path/to/pkg.sql
-....
-
 [[pkgng-clean]]
 === Removing Stale Packages