Firmware 6.7.1 Broken my 1 Network Interface and lots of other problems

1) How do I point it myself to the correct drive should this happen again ?

1. Create new .apps and home subvolume in new volume, (For example, MyData is new volume)

    a. Access NAS via SSH, then run below two commands,         

        btrfs subvol create /MyData/.apps

        btrfs subvol create /MyData/Home

2. /lib/systemd/system/apps.mount and /lib/systemd/system/home.mount were pointing to the NEW volume using vimtiny command,  (For example, MyData is new volume in below config)  

root@NAS:/# cd /lib/systemd/system
root@NAS:/lib/systemd/system# cat apps.mount
[Unit]
Description=Apps Directory
After=local-fs.target
Before=multi-user.target

[Mount]
What=/MyData/.apps
Where=/apps
Type=none
Options=bind

[Install]
WantedBy=multi-user.target
root@NAS:/lib/systemd/system# cat home.mount
[Unit]
Description=Home Directory
After=local-fs.target
Before=multi-user.target

[Mount]
What=/MyData/home
Where=/home
Type=none
Options=bind

[Install]
WantedBy=multi-user.target
root@NAS:/lib/systemd/system#

3.  Run OS Reinstall,

2) Should I not use my previous saved config file ? (last time I used this file and it has braked everything again)

You can't restore old config file because mount path is changed, if use old config, it will point to old volume in config file.