Let's assume space isn't an issue. You connect to Bluesky from your desktop computer, and its got storage enough to handle decades worth of image-and video-heavy account backups. Your account is safe, right? Maybe. To recover an account hosted by a failed PDS you'll need your recovery key, so make sure you don't lose that. And there's a 72-hour window in which it can override the signing key, so make sure none of this happens while you're taking a week-long break from social media.
To summarize: Bluesky makes accounts portable by taking everything important about them off of the servers that handle posting. Identity goes to a registry. Post history goes into an ever-growing backup on your own device. And most other functions are provided by services that crawl and index the entire network. To take full advantage of account portability, then, you'll have to shoulder some of the technical burden yourself, and make a few privacy tradeoffs.