Add Backup page, link from Home

Backup.md

@@ -0,0 +1,45 @@
+# Backup & Data folder
+
+## Where data is stored
+
+Roster stores all projects and requests as plain JSON files:
+
+```
+~/.local/share/cz.bugsy.roster/projects/    (native)
+~/.var/app/cz.bugsy.roster/data/cz.bugsy.roster/projects/    (Flatpak)
+  my-api/
+    _project.json       ← project metadata
+    get-users.json      ← one file per request
+    create-user.json
+  another-project/
+    _project.json
+    health-check.json
+```
+
+Each request is a self-contained JSON file. This makes the data folder suitable for version control — you can run `git init` there yourself and commit, diff, or share individual requests.
+
+## Opening the data folder
+
+**Preferences → Data → Data folder → Open**
+
+Opens the data folder in the system file manager. From there you can inspect files, run `git init`, or copy the folder manually.
+
+## Backup
+
+Backup copies the entire `projects/` directory to `{backup folder}/roster-backup/`.
+
+### Manual backup
+
+1. Open **Preferences → Data**
+2. Under **Backup folder**, click **Choose…** and select a destination
+3. Click **Backup** to copy files immediately
+
+### Auto-backup on save
+
+Enable **Auto-backup on save** in **Preferences → Data**. After each save Roster copies all project files to the backup folder automatically.
+
+> **Note:** Backup is additive — files removed from Roster are not deleted from the backup folder. To get a clean snapshot, delete `roster-backup/` manually before clicking Backup.
+
+## Migration from previous versions
+
+On first launch after upgrading, Roster automatically converts the old `requests.json` file to the new per-file format. The original file is kept as `requests.json.bak` in the data folder.

Home.md

@@ -25,6 +25,7 @@ Roster is a native GNOME application for testing and debugging HTTP APIs with su
 - [[Sensitive-Variables]] - Secure storage with GNOME Keyring
 - [[Scripts]] - Preprocessing and postprocessing automation
 - [[Export]] - Export requests to other tools
+- [[Backup]] - Back up and manage project data
 - [[History]] - Track and replay requests
 - [[Import]] - Import from OpenAPI/Swagger and WSDL