Other notable resources:
Hardware accelerated Machine learning requirements
Hardware accelerated Transcoding for videos
You’ll need a stronger CPU (or maybe multiple since you can run machine learning multiple machines) handle the load if not using a supported discrete GPU. Also for transcoding videos if you want to do that you’ll have to look at compatibility of the CPU with what it can encode/decode and what format you want to store.
That being said , it barely use CPU resources with immich 99% of the time with the exception when media is backing up to it.
At least one great thing about bitwarden, the passwords are stored on each device, so you kind of already have backups. That being said backups for vaultwarden is still beneficial.