For new users who are not good at linux, and who get to this post,
- here is a link to step-by-step tutorial on setting up an incremental backup / restore of BTRFS subvolume snapshots — How to Backup Btrfs Snapshots to External Drives
- here is a v good link suggested by @andreas85 for btrfs — Btrfs - Manjaro
- Snapshots are good for restoring Manjaro system. As for backup of user data at /home, @megavolt has suggested Vorta (https://vorta.borgbase.com/) which is a backup client for macOS and Linux desktops. It integrates the mighty Borg Backup with your favorite desktop environment to protect your data from disk failure, ransomware and theft.