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I use above combination on 5 machines running Manjaro.

right setup of BTRFS to support UEFI, root snapshots with included kernel + library (/var/lib) snapshots, bootable ro-snapshots of the entire system into DE/GUI.snap-sync to automatically make differential backups of Snapper snapshots to external btrfs formated storages, through ssh-tunnels.grub-btrfs to automatically update GRUB with boot menuentries to boot into Snapper ro-snapshots.snap-pac to automatically make snapshots with Snapper before and after installation of packages from repository and AUR.Snapper + Snapper GUI to take ro-snapshots, with automated cleanup algorithms.Thus i suggest to use another toolchain for btrfs snapshots and backups. And second: the btrfs snapshots taken with Timeshift are writeable snapshots to my knowledge, that’s a realy bad idea of a snapshot. Strongly speaking: Timeshift don’t support BTRFS backups, only snapshots on the same partition, and that’s not a real backup. But Timeshift does’nt support it with BTRFS.

BTRFS it self contains anything to take snapshots and backups to external storages. If you want to backup BTRFS snapshots then you have to use the combination of btrfs send | btrfs receive. I think your system is on another BTRFS partition as your 1TB BTRFS partition on sdb3. A snapshot is taken from the selected BTRFS partition into this partition, not across different partition. Timeshift supports BTRFS snapshots, but not backups.