How to migrate user data and preserve old links with Nginx

Yes, that happens often with shared hosts.

However, the screenshots I'm hosting don't really get much traffic so it's fine at the moment, unless of course something gets slashdotted then it's a different story :)

Since the screenshot hosting provided is complementary, I don't think it's possible to provide a SLA similar to that of paid hosting in the long run.

Unless of course if customers start telling me that they'd want reliable image hosting, then I'd offer to host their screenshots on a more reliable host (which also means higher costs) like Amazon S3.

An uptime monitoring tool like pingdom can help to alert you if the site's down and so far my dreamhost account happens to be hosted on a pretty reliable server (YMMV on different servers)

I recently launched another project called Storyteller:

http://storyteller.freshlog.com

that I've gotten pretty good feedback from fellow HN readers:

http://news.ycombinator.com/item?id=1347513

The nature of multiple screenshot hosting is slightly different for Storyteller, since I'm targeting folks who want to create multiple screenshot guides easily for online faqs, guides, documentation (another pain point of mine, Freshlog is more for one off communication) that requires more reliable hosting.

Hence the images are hosted on S3 and I intend to bill monthly for that.

Hope that helps =)