How about Cron? If it's just for copying your files / data, super easy to set up and extremely rapid, it doesn't do snapshots, it's just a simple 'copy my file to another place', but it works 👍

Use timeshift, install it, just chose where you want the backups to be installed, preferably a second HD or SD Flash. Chose when like once a day, week at start up for instance and forget it. Then if you screw up your Linux, just start in console mode, timeshift --restore and five mins later your up and running.

If you want just your data to be copied, then Cron

Both are standard Linux programs, often already installed depending on what Linux you have

It sounds like the best option would be a dual boot, Linux for everything except games and when you want to play just boot into Windows. If you do this i would strongly suggest a two HD set up, one for windows and one for Linux, for two reasons, if you don't like Linux then you still have the original windows setup, two Windows will at one moment wipe the dual boot grub and you'll 'lose' the Linux startup, unless you have one OS per Hard Disk. I don't game anymore. Like you I also have an old card Gtx760 🤣🤣

Like you i switched from about 30 years of windows to Linux almost three years ago, Ubuntu, Mint, Manjaro, Endeavour before ending up with Arch which I find perfect. I also have two PCs running Debian for HomeAssitant setups in two homes but I don't like Debian I sometimes use my wife's Windows setup for Garmin Express as that's the only windows program that I need. So keep on going, Windows is not missed,

I've used Joplin for years now before was Evernote. I like it because it's open source and the syncing option is built in, exemple either to Dropbox or NextCloud (I use both these options, DB only because I have a free option of 12gB otherwise I would use just NC) The syncing is painless as as I said built-in. It's not a pretty app, fairly plain, but it works perfectly, on my android and Linix PCs, Arch and Debian. I did try Obsidian once. It's pretty, but not being open source put me of. Try it again, takes minutes to set up, as again open source and works well

I don't use Trillium, tried once Obsidian but it's not free. Have you tried Joplin, it's free works extremely well with Dropbox or NextCloud for syncing between téléphone and the PC. For note taking its extremely good

For note taking, Joplin is pretty good, in fact I went from Simplenote to Evernote (over kill and not free) to Joplin using Dropbox for the syncing (syncing is done by Joplin, so you don't need a 'syncing' app) between my PCs, all Linux and my Android phone. Simple to set up and free. I do not use it as a Journal as that is extremely poor, but for notes, it's perfect

I use timeshift, on Arch and a Debian setup . It's simple to set up, I do a automatic snapshot once a day, so if something breaks, just boot into tty and restore the previous day's snapshot, takes about five minutes. Not sure why you say ext4 doesn't work as it does. Haven't tried the other programs that you talked about

Diaro sends me a notification and the end of the Day, reminding me to write something.

I keep a diary using Diaro on my android phone. I started a long time ago in note books, but as even I can't alway read my own writing, switched to typing. I don't write much, mostly rubbish, what I do find useful is the ability to search and find things, 'repaired the fridge' 'changed the battery in the smoke alarm', 'had so and so around for dinner' , 'bought this and that' .... It's only for myself, do when I'm dead and gone it will just disappear like myself

Not that I remember

The Arch install is much lighter, Endeavour like many other linuxes, installs programs that you may or may not require. I prefer adding programd when I require them

I went from Manjaro to Arch. Installed by command line (took a few tries to get it done... ) I tried their installer but it wasn't very good. Have also run Endeavour on a second pc for a while but I prefer pure Arch.