Seeking Advice on Appian On-Premise Upgrade Path (23.3 to 25.3) with HA Setup

Hi Community,

We’re planning to upgrade our on-premise Appian environment from version 23.3 to 25.3. Based on the official documentation, it appears that a direct upgrade isn’t supported, and we’ll need to follow a sequential path: 23.3 → 25.1 → 25.3.

I’d appreciate any insights on the following:

1. Is this sequential upgrade path (via 25.1) the recommended or most stable approach?
2. For those running Appian in a High Availability (HA) setup, how did you manage the upgrade across multiple instances?
3. Were there any challenges or performance impacts during the production upgrade, especially related to backup/restore of large volumes of data?
4. Any lessons learned or best practices you’d recommend to ensure a smooth upgrade?

Thanks in advance for your guidance and experiences!

Best,
Ramanji