docs: update backup encryption example

docs/how-tos/encrypt-backup.md

@@ -1,29 +1,39 @@
 ---
-title: Encrypt backups using GPG
+title: Encrypt backups
 layout: default
 parent: How Tos
 nav_order: 8
 ---
 # Encrypt backup
 
-The image supports encrypting backups using GPG out of the box. In case a `GPG_PASSPHRASE` environment variable is set, the backup archive will be encrypted using the given key and saved as a sql.gpg file instead or sql.gz.gpg.
+The image supports encrypting backups using one of two available methods: GPG with passphrase or GPG with a public key
+
+## Using GPG passphrase
+
+The image supports encrypting backups using GPG out of the box. In case a `GPG_PASSPHRASE` or `GPG_PUBLIC_KEY` environment variable is set, the backup archive will be encrypted using the given key and saved as a sql.gpg file instead or sql.gz.gpg.
 
 {: .warning }
-To restore an encrypted backup, you need to provide the same GPG passphrase or key used during backup process.
+To restore an encrypted backup, you need to provide the same GPG passphrase used during backup process.
 
 - GPG home directory `/config/gnupg`
 - Cipher algorithm `aes256`
-- 
-To decrypt manually, you need to install `gnupg`
 
-### Decrypt backup
+{: .note }
+The backup encrypted using `GPG passphrase` method can be restored automatically, no need to decrypt it before restoration.
+
+
+To decrypt manually, you need to install `gnupg`
 
 ```shell
 gpg --batch --passphrase "my-passphrase" \
 --output database_20240730_044201.sql.gz \
 --decrypt database_20240730_044201.sql.gz.gpg
 ```
+Using your private key
 
+```shell
+gpg --output database_20240730_044201.sql.gz --decrypt database_20240730_044201.sql.gz.gpg
+```
 ### Backup
 
 ```yml