docs: add retention section, fix running backups location, update example table

Backup-Profiles.-.md

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+# Backup Profiles
+
+Profiles define what gets backed up, how it's compressed, where it's stored, and what to exclude.
+
+## Default Profile
+
+A default profile is created on install with these settings:
+- **Type**: Full site (database + files)
+- **Format**: ZIP, compression level 5
+- **Backup dir**: `administrator/components/com_mokosuitebackup/backups`
+- **Excluded dirs**: backups dir, tmp, cache, logs, administrator/logs
+- **Excluded files**: .gitignore, .htaccess.bak
+- **Excluded tables**: `#__session`
+
+## Backup Types
+
+| Type | Database | Files | Use Case |
+|---|---|---|---|
+| **Full** | Yes | All files | Complete site snapshot |
+| **Database Only** | Yes | No | Quick DB backup before changes |
+| **Files Only** | No | All files | Code/media backup |
+| **Differential** | Yes (full) | Changed only | Fast daily backups between weekly fulls |
+
+## Retention
+
+Each profile has its own retention settings in the **Retention** tab:
+
+| Setting | Description |
+|---|---|
+| **Keep Backups (days)** | Delete completed backups older than this many days |
+| **Keep Backups (count)** | Maximum number of completed backups to keep (oldest removed first) |
+
+Set either value to **0** to use the global default from component options (**Options > Cleanup**).
+
+The system plugin checks retention on every admin page load (throttled to once per hour). Cleanup runs per-profile: each profile's retention settings are evaluated independently, and the stricter limit (age or count) wins.
+
+## Creating Profiles
+
+1. Go to **Components > MokoSuiteBackup > Backup Profiles**
+2. Click **New**
+3. Configure each tab (General, Archive, Filters, Notifications, Retention, Remote)
+
+## Running Backups
+
+From the **Dashboard**:
+1. Select a profile from the dropdown
+2. Click **Backup Now**
+3. A progress modal shows real-time step completion
+4. The AJAX step engine works even on shared hosting with PHP time limits
+
+## Example Setup
+
+| Profile | Type | Schedule | Remote | Retention |
+|---|---|---|---|---|
+| Daily Full | Full | Daily at 02:00 | S3 | 30 days / 30 backups |
+| Hourly DB | Database Only | Every hour | FTP | 7 days / 168 backups |
+| Weekly Differential | Differential | Weekly Sunday | Google Drive | 90 days / 12 backups |