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Cross-platform people: Do you do cross-platform accessible backups?

A quick summary of my setup: Desktop PC, dual-booting Linux Mint 21.x and Win11, Linux is primary OS, Win11 mainly for gaming. I also have a laptop I occasionally use that is running "unsupported Windows 11", which I briefly dual-booted until weird sound issues ended up affecting both operating systems and went away when only running Windows.

All of my backups are encrypted with veracrypt, I run all my backups from Linux since my migration to Linux in 2018, but obviously in the early days I wasn't certain that I would stay with Linux so the filesystem in use in the encrypted containers was always NTFS, then steadily I changed some backup drive filesystems over to ext3/4 partly to reduce CPU usage during the backup and partly in the hope that I might increase throughput (it didn't and the throughput is basically fine).

As Microsoft continues to take Windows in a direction that I don't appreciate much, I'm fairly certain that I will be staying with Linux, but the fact of the matter is that I have more Windows knowledge than Linux and if push came to shove (let's say my desktop PC burst into flames and there was nothing left but a pile of ash), I could easily see the possibility of running Windows exclusively / "first" in the short term while I pick up the pieces. As such I'm wondering if I should change all the backup drive file systems back to exFAT / NTFS to give myself greater flexibility for this worst case scenario event.

Thoughts? The choice seems like a no-brainer but I'm wondering if I'm looking at this situation from enough angles.

One complication I can think of is that my home directory has a wine folder in and IIRC that folder contains at least one folder with a colon symbol in the name which something other than ext3/4 will have a fit over, but I could easily exclude that folder structure from the backups.
 
I'd keep the libre file systems, and think of a different way to recover in case of disaster. Bootable usb would be an obvious choice. Even when I ran windows, I very much preferred libre tools. They're more trustworthy, and future proof. Knowledge will never be lost since anyone can view the docs and replicate it. Maybe not *you*, but there's always the option of paying someone to do it for you. Good luck with proprietary systems.
 
When I used to have more Windows machines I would store most data on a SMB share to the NAS, which is Linux, so it got backed up at that point. For backing up stuff like user profile I would have a local Windows job that would copy files to the SMB share. I used a tool called Syncback. Robocopy would work too.
 
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