Is it possible to somehow make nextlcoud work in a "double"?

Question

ownCloud/Nextcloud

I have a "server room", roughly speaking, it sometimes happens there that the light disappears or the Internet ... and the cloud at this moment is extremely necessary, maybe there is some way to make an ATS (emergency reserve input) for this? So that 2 servers work at the same time, but the second, let's say, on a very weak PC, just slowly kept up with the second, and when the first one had a screw, the second one worked at least somehow

Answer 1

A lot depends on the scenario.
1. For example, you can simply make a second copy of Nextcloud, where files from the main copy will be regularly copied by scripts. And in case the first copy disappears, then the data is available on the second copy.
Cons:
- Synchronization may have a delay
- The second copy must be READ ONLY, because it is difficult to synchronize data in both directions -
The address of the second copy will be different, so it will need to be changed manually. You can probably mold your Load Balancer on your knee, but it will obviously be limited in functionality.
2. You can make a full-fledged high availability, but for this you need:
- DB cluster
- File system cluster
- Load Balancer
An example of such a configuration is described here:
https://severalnines.com/database-blog/deploying-h...
But "on a very weak PC" does not fit here.
And such a configuration is quite difficult to configure, maintain and update.