docs: update backup instructions

docs/content/doc/setup/backups.md

@@ -10,12 +10,17 @@ menu:
 
 # What to backup
 
-Vikunja does not store any data outside of the database.
-So, all you need to backup are the contents of that database and maybe the config file.
+There are two parts you need to back up: The database and attachment files.
 
 {{< table_of_contents >}}
 
-## MySQL
+## Files
+
+To back up attachments and other files, it is enough to copy them [from the attachments folder]({{< ref "config.md" >}}#basepath) to some other place.
+
+## Database
+
+### MySQL
 
 To create a backup from mysql use the `mysqldump` command:
 
@@ -31,7 +36,7 @@ To restore it, simply pipe it back into the `mysql` command:
 mysql -u <user> -p -h <db-host> <database> < vkunja-backup.sql
 {{< /highlight >}}
 
-## PostgreSQL
+### PostgreSQL
 
 To create a backup from PostgreSQL use the `pg_dump` command:
 
@@ -49,6 +54,6 @@ psql -U <user> -h <db-host> <database> < vikunja-backup.sql
 
 For more information, please visit the [relevant PostgreSQL documentation](https://www.postgresql.org/docs/12/backup-dump.html).
 
-## SQLite
+### SQLite
 
-To backup sqllite databases, it is enough to copy the database elsewhere.
+To back up sqllite databases, it is enough to copy the [database file]({{< ref "config.md" >}}#path) to somwhere else.