A partition for each one the drive should work alright, but it may turn to custard if they both try to access the drive at the same time.
To be honest I haven't had the need or the time to delve that deeply into how Timeshift works sorry.
You should be able to highlight the ones that you want to remove then click on the delete button.
From what I understand is that each backup is just the difference between the original backup and the current system.
Hannah Montana Linux
I had this come up when I was using a locked down version of FF.
Basically what happened was the security settings were not allowing Twitch the access it required.
Once I went through and allowed access it worked fine.
This happened often with Sync for Reddit.
The dev would be away for a while then come back with a big update to functionality and a number of bugs fixed.
Lemmy itself is still not a mature platform and is a moving target when third party app devs are trying to keep up with the changes.
And if I recall correctly this is a side project for him so updates are not as regular as people expect.
Are you sure he didn't leave because he couldn't find the exit?
I had been expecting this.
Lemmy itself is still a work in progress and the new version apparently makes some major changes from the current version.
Sync is currently in a usable stable state so instead of squashing bugs in the current Sync version it was a better use of their dev time to work on a build for 0.19.
That's because laptop (and some desktop motherboard) manufacturers love to cut costs wherever they can so they end up using some weird non standard sound card from Billy Bob's discount computer parts because they know they can require the use of drivers to band aid over the shitty hardware with a software fix.
Then when using Linux it tends to either not work or have shit sound until some kind soul adds in a config file for the devices sound card.
Do not expect things to work as they do in Windows.
While you can get most things done via a GUI option using the Terminal is much more powerful and gives more information.
This pertains mostly to Laptops and peripherals, but always do a quick Google search to check for any issues.
One of the big issues for people is sound, a lot of computer & parts makers like to use the cheapest no-name parts they can because Windows lets them require "drivers" aka software fixes for poor hardware whereas Linux tends to give unaltered output leading to complaints about sound quality.
You are not going to find software from Adobe, Microsoft office 365 etc running on Linux even using WINE.
Some games will not work on Linux even using the Proton compatibility software.
There is a lot of software made for Linux are made by devs who focus more on the under the hood performance than making the software GUI look pretty. So don't be put off by the looks of a lot of Linux software.
I highly recommend Using the Alternativeto website to (as the name implies) find alternatives to software you use on Windows.
Setup an external device be it an internal hard drive, external hard drive or NAS as a backup target for your files.
You can use Timeshift to backup the entire drive (and it can reload a chosen backup directly onto the drive), Lucky backup to sync specified folders (either one way or both ways) to your drives or as I do use both.
And backup before doing major updates.
I have Timeshift setup to backup the entire drive (including $home) to a separate internal HDD and Luckybackup set to backup my important folders to an external USB HDD.
As you are learning how to use and navigate you will have accidents that will require a full reinstall, don't fear this has happened to everyone else and why you backup your files so it's an annoyance instead of the end of the world.
It's not so much both computers being able to access it.
From what I have experienced Timeshift tends to lock a drive when it is doing a backup.
If computer 1 is doing a backup and computer 2 tries to start it's backup it may fail without you noticing.
Giving each computer their own partition on the drive should alleviate the problem.