Other Backing up to an ext4 external disk

Hoping to get some advice about best practices when writing backups to non-native file systems.

Currently, I have an install of 15.1 on the internal sata ssd disk of my laptop, and have rsnapshot set up to make redundent copies of /home, /etc and /usr/local to a different ufs partition on the same disk. Seems to work fine as I have extracted some files from the backup to repair my email client after a configuration mishap.

I also have a larger 2.5" ssd external disk tethered with a usb adapter, that contains quite a bit of archived data , is intended to be stored offsite and to be also used for back-ups of /home. The partitions on it are ext4, as I have been using linux for a while previous.

Creating a first time rsnapshot to the linux disk took longer than expected, even accounting for the usb slowness. Of course in a perfect world I would have an external backup disk formatted ufs for freebsd. And a different backup disk just for linux installs, but then I would still need to sync /home across 2 different file types.

would dump/restore or rsync be a better choice than rsnapshot?

am I better off writing to ext4 fs volumes with freebsd drivers or looking for a way to write to ufs from linux?
 
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