release: bump version to v3.1.4

- Update VERSION in backupd.sh to 3.1.4
- Add v3.1.4 changelog with multi-distro support details
- Update USAGE.md prerequisites (curl/wget, sha256sum, base64)
- Update README.md requirements and add multi-distro feature

This release adds comprehensive multi-distribution package manager
support (apt, dnf, yum, pacman, apk, zypper) and wget fallback
for systems without curl.

Author: wnstfy

CHANGELOG.md

@@ -7,6 +7,46 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ---
 
+## [3.1.4] - 2026-01-09
+
+### Added
+
+- **Multi-distribution package manager support** — Automatic detection and installation of dependencies across 6 package managers
+  - apt (Debian, Ubuntu, Mint, Pop!_OS, Kali, Raspbian)
+  - dnf (Fedora, RHEL 8+, Rocky Linux, AlmaLinux, Amazon Linux)
+  - yum (RHEL 7, CentOS 7, Oracle Linux)
+  - pacman (Arch Linux, Manjaro, EndeavourOS, Artix)
+  - apk (Alpine Linux)
+  - zypper (openSUSE, SLES)
+
+- **wget fallback support** — All HTTP operations now work with either curl or wget (BACKUPD-007)
+  - `download_to_file()` helper with curl/wget fallback
+  - `fetch_url()` helper with curl/wget fallback
+  - Updated `curl_with_retry()` with wget fallback
+  - Updated `check_network()` with wget fallback
+  - Updated `get_latest_version()` with wget fallback
+
+- **Explicit dependency checks** — Added sha256sum and base64 to required commands validation
+
+### Improved
+
+- **Unsupported distribution handling** — Graceful warnings with manual install instructions instead of failures (BACKUPD-005)
+- **Error messages** — Distro-appropriate install hints via `get_install_hint()` function (BACKUPD-006)
+- **bzip2 installation** — Now uses package manager abstraction for RHEL-family distros (BACKUPD-002)
+- **unzip installation** — Cross-distribution support via package manager abstraction (BACKUPD-004)
+- **argon2 installation** — Works across all 6 supported package managers (BACKUPD-003)
+- **systemd detection** — Improved messaging when systemd/systemctl not available
+
+### Technical
+
+- Added `detect_package_manager()` function with caching
+- Added `pkg_install()` abstraction for cross-distro package installation
+- Added `pkg_update()` with run-once semantics
+- Added `get_install_hint()` for user-friendly error messages
+- Removed hardcoded `apt-get` calls in favor of package manager abstraction
+
+---
+
 ## [3.1.3] - 2026-01-09
 
 ### Fixed

README.md

@@ -62,6 +62,7 @@ This tool provides exactly that.
 - 🗄️ **Database Backups** — All MySQL/MariaDB databases, individually compressed and encrypted
 - 📁 **Web App File Backups** — Backs up any web application (WordPress, Laravel, Node.js, PHP, static sites)
 - 🖥️ **Multi-Panel Support** — Auto-detects Enhance, xCloud, RunCloud, Ploi, cPanel, Plesk, CloudPanel, CyberPanel, aaPanel, HestiaCP, Virtualmin
+- 🐧 **Multi-Distribution Support** — Works on Debian, Ubuntu, Fedora, RHEL, CentOS, Arch, Alpine, openSUSE and derivatives
 - 🔐 **Machine-Bound Encryption** — Credentials encrypted with AES-256, tied to your server
 - ☁️ **Cloud Storage** — Supports 40+ providers via rclone (S3, B2, Wasabi, Google Drive, etc.)
 - ⏰ **Automated Scheduling** — Systemd timers with automatic retry and catch-up
@@ -100,13 +101,15 @@ curl -fsSL https://raw.githubusercontent.com/wnstify/backupd/develop/install.sh
 
 | Requirement | Notes |
 |-------------|-------|
-| **OS** | Ubuntu 20.04+, Debian 10+ (or compatible) |
+| **OS** | Ubuntu, Debian, Fedora, RHEL, CentOS, Arch, Alpine, openSUSE (and derivatives) |
 | **Access** | Root or sudo |
 | **MySQL/MariaDB** | For database backups |
-| **systemd** | For scheduled backups |
+| **systemd** | For scheduled backups (optional, manual backups work without) |
+| **curl or wget** | At least one required for downloads |
 | **restic** | Auto-installed (backup engine with encryption + deduplication) |
 | **rclone** | Auto-installed (cloud storage transport) |
 | **argon2** | Auto-installed (modern encryption, falls back to PBKDF2 if unavailable) |
+| **bzip2, unzip** | Auto-installed (for extracting restic and rclone) |
 
 ---
 

USAGE.md

@@ -1,6 +1,6 @@
 # Usage Guide
 
-Complete usage documentation for **Backupd v3.1.3** by Backupd.
+Complete usage documentation for **Backupd v3.1.4** by Backupd.
 
 > **Note:** v3.1.0 adds multi-job support for managing multiple backup configurations.
 > v3.0.0 introduced restic as the backup engine, replacing GPG+tar+pigz.
@@ -57,13 +57,16 @@ The following will be **automatically installed** if missing:
 These packages are typically already available on most Linux systems:
 - `openssl` - credential encryption
 - `tar` - archive operations
-- `curl` - notifications
+- `curl` or `wget` - downloads and notifications (at least one required)
+- `sha256sum` - checksum verification
+- `base64` - encoding operations
 
 ### Verify prerequisites (optional)
 
 ```bash
 # Check tools (these are usually pre-installed)
-which openssl tar curl
+which openssl tar sha256sum base64
+which curl || which wget  # At least one required
 
 # After installation, verify auto-installed tools
 which restic rclone

backupd.sh

@@ -15,7 +15,7 @@
 # ============================================================================
 set -euo pipefail
 
-VERSION="3.1.3"
+VERSION="3.1.4"
 AUTHOR="Backupd"
 WEBSITE="https://backupd.io"
 INSTALL_DIR="/etc/backupd"