duplicity: add page (#1443)

pages/common/duplicity.md

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+# duplicity
+
+> Creates incremental, compressed, encrypted and versioned backups and optionally uploads them to a variety of backend services.
+
+- Backup a folder via ftps to a remote machine, encrypting with a password:
+
+`FTP_PASSWORD={{ftp_login_password}} PASSPHRASE={{encryption_password}} duplicity {{path/to/source/directory}} {{ftps://user@hostname/target/directory/path/}}`
+
+- Backup a folder to Amazon S3, doing a full backup every month:
+
+`duplicity --full-if-older-than {{1M}} --use-new-style s3://{{bucket_name[/prefix]}}`
+
+- Delete versions older than 1 year from a backup stored on a webdav share:
+
+`FTP_PASSWORD={{webdav_login_password}} duplicity remove-older-than {{1Y}} --force {{webdav[s]://user@hostname[:port]/some_dir}}`
+
+- List the backups available:
+
+`duplicity collection-status "file://{{absolute/path/to/backup/folder}}"`
+
+- List the files in a backup stored on a remote machine via ssh:
+
+`duplicity list-current-files --time {{YYYY-MM-DD}} scp://{{user@hostname}}/path/to/backup/dir`
+
+- Restore a folder from a gpg-encrypted local backup to a folder:
+
+`PASSPHRASE={{gpg_key_password}} duplicity restore --encrypt-key {{gpg_key_id}} --file-to-restore {{relative/path/restorefolder}} file://{{absolute/path/to/backup/folder}} {{path/to/directory/to/restore/to}}`