Time capsule unrecognised volume error and not restarting

I tried backing up today and got a "unrecognised volume error" - that my disk had changed identity and a question whether I wanted to proceed to use the current disk. I chose yes but the backup failed.

So I tried powering off the Time Capsule as I thought that would resolve the issue. Only the time capsule rebooted with an orange light and was making strange clicking noises. I left this for 10 minutes but it still didn't reboot. And there was no connection to the Time Capsule through Airport Utility and no wifi.

So I thought I'd give it another reboot, this time it seemed to get further as after 5 minutes it was making some loading sounds then it stopped making noise and was still on orange, with no Airport Utility connection or wifi.

At this point I googled for the issue and there were lots of reports of Time Capsules dying without any kind of solution.

I was now thinking I may need to buy a new Time Capsule. But before doing that I thought I'd ask Apple Care for assistance. On the website I put in a problem with backing up on my MacBookPro (which has Apple Care) and I was able to get them to call me immediately.

Initially the support analyst asked me to do a software update on my Mac, then I explained I had rebooted the Time Capsule and it was showing an orange light (and I had no wifi), he then said we need to fix that issue first. Then the support analyst instructed me how to do a reset/reboot by pressing in a small button at the rear of the Time Capsule (I didn't know about this!). Unfortunately after several attempts that didn't seem to do anything - it was meant to make the light start flashing.

Anyway the next step was to unplug the Time Capsule and leave for 10 seconds and plug it in again. Miraculously the Time Capsule started flashing an orange light, making booting sounds and then it went green. I checked the computer and there was wifi and the Airport Utility could talk to the Time Capsule. I then kicked off a backup and this time it worked.

Thank you Apple Care!

Backup disk not available - Apple Time machine

After migrating from one Apple MacBook Pro to the next, Time Machine / Time Machine then complained that "Backup disk not available". What follows is details of how I was able to resolve the issue;

1) Turned off Time Machine on and off again to no avail
2) Can access time capsule via finder
3) In time machine options/preferences chose "select disk" and from the available disk I selected my computer "data"
4) It then said "inherit backup history" previous computer will no longer be able to backup - say yes
5) Then there is a long wait whilst time machine is "looking for backup disk"
6) Then it said "the backup disk ***sparsebundle is already in use and cannot backup
7) So I logged on previous MBP and went to Finder and opened the time capsule folder and clicked "Disconnect" at the top
8) I then tried selecting the disk again, error again that it is in use
Checked the log/console by filtering on "backupd" and it showed the sparse bundle was already mounted and it couldn't unmount it
9) So I went to finder on my new MBP and clicked the circular eject button next to it (The Time capsule drive)
10) I retried selecting the disk in time machine preferences and it asked me if I wanted to inherit again
11) This time the log looked better, and the time capsule went into "preparing mode"
Warning, it remained in "preparing mode" for a very long time before it started generating any further logs and doing anything
12) It disconnected part way through over night, I started it again, and it failed without an error message, I kicked it off again this time it started but it wanted to back up 200+GB, so I cancelled it, then I read that it will delete old backups when it runs out of space - so I have restarted the backup again, fingers crossed.
13) The backup is now working and it is logging its progress (occasionally) as it writes the backups