I've probably spent way too much time thinking about Linux backup over the years. But thankfully, I found a setup that works really well for me in 2018 or so, used it for the last few years, and I wrote up a detailed blog post about it just a month ago:
https://amontalenti.com/2024/06/19/backups-restic-rclone
The tools I use on Linux for backup are restic + rclone, storing my restic repo on a speedy USB3 SSD. For offsite, I use rclone to incrementally upload the entire restic repository to Backblaze B2.
The net effect: I have something akin to Time Machine (macOS) or Arq (macOS + Windows), but on my Linux laptop, without needing to use ZFS or btrfs everywhere.
Using restic + some shell scripting, I get full support for de-duplicated, encrypted, snapshot-based backups across all my "simpler" source filesystems. Namely: across ext4, exFAT, and (occasionally) FAT32, which is where my data is usually stored. And pushing the whole restic repo offsite to cloud storage via rclone + Backblaze completes the "3-2-1" setup straightforwardly.
https://amontalenti.com/2024/06/19/backups-restic-rclone
The tools I use on Linux for backup are restic + rclone, storing my restic repo on a speedy USB3 SSD. For offsite, I use rclone to incrementally upload the entire restic repository to Backblaze B2.
The net effect: I have something akin to Time Machine (macOS) or Arq (macOS + Windows), but on my Linux laptop, without needing to use ZFS or btrfs everywhere.
Using restic + some shell scripting, I get full support for de-duplicated, encrypted, snapshot-based backups across all my "simpler" source filesystems. Namely: across ext4, exFAT, and (occasionally) FAT32, which is where my data is usually stored. And pushing the whole restic repo offsite to cloud storage via rclone + Backblaze completes the "3-2-1" setup straightforwardly.