###Background

  I have an old MBP which works fine right now.  I have no immediate plans to change it.

But it is getting old, the discrete GPU died, and I expect it could die at any time.  *I would like to keep my option open to move to a Linux laptop when this machine dies.  Most of the software I use is either open source or runs on Linux as well and I rely heavily on Terminal/bash already.* Considering that and not wanting to be tied to macOS due to not having a solid cross-platform backup, here's my current backup strategy to allow either a Mac or linux based OS to be my next computer for my current data.

###modified backups

- keep frequent backups, but, rather than relying only on Time Machine, backup `/Users/` via `rsync` as well.  (what file system is my best bet here?)

- run preliminary trials on restoring the rsync backups into a test Linux VM.

As you an see - I'm not decided what filesystem I should use to rsync as Time Machine backs up to HFS+ and since I haven't picked a Linux it's not clear if I want / can mount HFS+ to read the backup data.

What setup allows me to restore my data that is backed up with `rsync` to any Linux?