QUESTION: Does the backup command / script work in a Wayland environment?

**Describe the bug**
Running the Flatpak version of CopyQ v9.1.0 with the **Backup On Exit** command added and enabled and the backups have never worked. I have enabled this and had it work on _**MANY**_ other systems whether they be Linux, Mac, or Windows (mostly Linux) for years now. I am currently running the Alpha pre-release of Pop!_OS Cosmic (Alpha 3 right now - have been running since the initial Alpha version) using the Flatpak install of CopyQ (because I cannot get the deb version to work on Wayland ... did I ever mention how unhappy I am with Wayland?)

I believe that have found where the CopyQ data is located for the Flatpak install (not a big Flatpak or Snap fan either). Please confirm this.

```
./.var/app/com.github.hluk.copyq/config/copyq/
```

So if this is correct, I can certainly backup the files if necessary but it sure would be nice if the built-in backup on exit worked.

**To Reproduce**

Run CopyQ on Pop!_OS 24.04 Cosmic (which is running a Wayland DE)

**Expected behavior**
It would be great if the backup on exit worked

**Screenshots**

**NONE**

**Version, OS and Environment**

```
rstrom@pop-os:~/.var/app/com.github.hluk.copyq/config/copyq$ flatpak run com.github.hluk.copyq version
CopyQ Clipboard Manager 9.1.0
Qt: 6.7.3
KNotifications: 6.7.0
Compiler: GCC
Arch: x86_64-little_endian-lp64
OS: KDE Flatpak runtime
```

```
rstrom@pop-os:~/.var/app/com.github.hluk.copyq/config/copyq$ env
SHELL=/bin/bash
WINDOWID=0
COLORTERM=truecolor
GTK_IM_MODULE=ibus
COSMIC_PANEL_BACKGROUND=ThemeDefault
SSH_AUTH_SOCK=/tmp/ssh-AjOm0o3RjPt8/agent.3348
DRI_PRIME=pci-0000_00_02_0
XMODIFIERS=@im=ibus
SSH_AGENT_PID=3349
XDG_SEAT=seat0
PWD=/home/rstrom/.var/app/com.github.hluk.copyq/config/copyq
XDG_SESSION_DESKTOP=COSMIC
LOGNAME=rstrom
XDG_SESSION_TYPE=wayland
COSMIC_DATA_CONTROL_ENABLED=1
...
XDG_CURRENT_DESKTOP=COSMIC
WAYLAND_DISPLAY=wayland-1
CLUTTER_IM_MODULE=ibus
QT_QPA_PLATFORM=wayland;xcb
LESSCLOSE=/usr/bin/lesspipe %s %s
COSMIC_PANEL_SIZE=S
TERM=xterm-256color
COSMIC_PANEL_NAME=Dock
LESSOPEN=| /usr/bin/lesspipe %s
LIBVIRT_DEFAULT_URI=qemu:///system
USER=rstrom
DISPLAY=:1
SHLVL=1
MOZ_ENABLE_WAYLAND=1
QT_IM_MODULE=ibus
XDG_VTNR=1
XDG_SESSION_ID=4
COSMIC_PANEL_OUTPUT=eDP-1
PANEL_NOTIFICATIONS_FD=20
XDG_RUNTIME_DIR=/run/user/1000
COSMIC_PANEL_ANCHOR=Bottom
QT_AUTO_SCREEN_SCALE_FACTOR=1
XCURSOR_THEME=Cosmic
XDG_DATA_DIRS=/home/rstrom/.local/share/flatpak/exports/share:/var/lib/flatpak/exports/share:/usr/local/share:/usr/share
GDK_BACKEND=wayland,x11
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin
QT_ENABLE_HIGHDPI_SCALING=1
DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus
RUST_BACKTRACE=1
ALACRITTY_WINDOW_ID=0
X_PRIVILEGED_WAYLAND_SOCKET=110
```

- OS (for example Windows 11, Ubuntu 22.04, macOS Sonoma 14.4)

```
rstrom@pop-os:~/.var/app/com.github.hluk.copyq/config/copyq$ cat /etc/os-release
NAME="Pop!_OS"
VERSION="24.04 LTS"
ID=pop
ID_LIKE="ubuntu debian"
PRETTY_NAME="Pop!_OS 24.04 LTS"
VERSION_ID="24.04"
HOME_URL="https://pop.system76.com"
SUPPORT_URL="https://support.system76.com"
BUG_REPORT_URL="https://github.com/pop-os/pop/issues"
PRIVACY_POLICY_URL="https://system76.com/privacy"
VERSION_CODENAME=noble
UBUNTU_CODENAME=noble
LOGO=distributor-logo-pop-os
```

- Desktop environment, window manager (if applicable)

```
rstrom@pop-os:~/.var/app/com.github.hluk.copyq/config/copyq$ printf 'Desktop: %s\nSession: %s\n' "$XDG_CURRENT_DESKTOP" "$GDMSESSION"
Desktop: COSMIC
Session:
rstrom@pop-os:~/.var/app/com.github.hluk.copyq/config/copyq$ env | grep -i wayland
XDG_SESSION_TYPE=wayland
WAYLAND_DISPLAY=wayland-1
QT_QPA_PLATFORM=wayland;xcb
MOZ_ENABLE_WAYLAND=1
GDK_BACKEND=wayland,x11
X_PRIVILEGED_WAYLAND_SOCKET=110
```

**Additional context**