Use snapper snapshots to backup to external drive
This bash script sends incremental snapshots to another drive for backing up data. Plug in and mount any btrfs-formatted device you want your system to be backed up to (like a USB drive). When you run the script you will be prompted to select a mounted btrfs device, or you can optionally select the disk using its UUID on the command line.
This is a companion discussion topic for the original entry at https://copr.fedorainfracloud.org/coprs/peoinas/snap-sync/