Added arch update and snapshot info

Arch.md

@@ -12,6 +12,11 @@ tags:
 - Graphical Software Management tools are not compatible and the command line must be used
 - Packages are installed with `pacman -S <package>`
 - `pacman -Syu` will update all the software on your system
+- It's worth checking the [Arch News](https://archlinux.org/news/) before running an update, or if you have any issues with an update. The Arch maintainers will always put known update issues there and how to resolve them.
+- Due to the fast moving pace of Arch you should aim to update your system at least once per week
+  - It shouldn't be a problem if you take longer, but it helps minimize risk.
+  - It's usually smart to not do system updates right before you need the computer for an important
+    - [System Snapshots](ArchSetup.md#bootable-system-snapshots) can help reduce this issue by having the option to just rollback
 
 ### pacnew
 Sometimes while updating you system you may get a warning about a ".pacnew" file being created.

ArchSetup.md

@@ -15,3 +15,25 @@ The wiki is wrong and your ${GRUB_MODULES} needs to be in ""
 5. Enable Secure Boot and import your MOK.cer into shim's MOK list.
 
 **Note:** If you ever re-install the GRUB `grubx64.efi` file (to get a newer version of GRUB for example), make sure to do so with the modules as described above, and you will need to re-sign the file with `sbsign`.
+
+## Bootable System Snapshots
+### Setup
+**Note:** For the below to work Arch must be installed on a btrfs filesystem with seperate root (@) and home (@home) subvolumes. (This is the default for EndeavourOS when you select btrfs.) And you must be using GRUB as your bootloader.
+
+1. Install the following packages:
+   - `btrfs-progs` - Utilies for btrfs
+   - `grub-btrfs` - automatically adds Snapshots to the GRUB menu
+   - `timeshift` - creates and manages snapshots
+   - `inotify-tools` - used by grub-btrfs to spot new snapshots
+2. Open timeshift and go through the setup, I recommend not including @home in snapshots.
+3. Run `sudo systemctl edit --full grub-btrfsd` and adjust the `ExecStart=` line to be `ExecStart=/usr/bin/grub-btrfsd --syslog --timeshift-auto`
+4. Enable grub-btrfs with `sudo systemctl enable --now grub-btrfsd`
+5. Install `timeshift-autosnap` from the AUR
+6. Edit the timeshift-autosnap config as desired, but be sure to disable it updating GRUB and that will conflict with `grub-btrfs`
+
+### Usage
+When you preform a system update a snapshots should automatically be created.
+You can also manually create snapshots from the timeshift program.
+
+If you boot into a snapshot or otherwise want to use a snapshot, first open timeshift and `restore` the snapshot you want to use (or are booted into) and then reboot. 
+This will properly restore the system to that snapshot.