How to upload videos to Flickr using Uploadr

First option, there are some excellent services that provide online backup solutions for a reasonable price. Two examples are Mozy and Backblaze. The advantage is that you can set it and forget it, and it will back up all your files (with options for some things you might want to exclude).

Another option is using Dropbox. You can move your iPhoto Library from your Pictures folder to the Dropbox folder and alias it to the original location (drag using ⌘option to make an alias instead of a copy). If you don't alias it, iPhoto should just ask you where the library is stored when you relaunch it anyway.

I don't really think of services like Flickr as backup, they're more of an online photo organizer, but yes they can be used that way too. There is no synchronization, so you have to upload your updated files manually.

I use the Posterous Spaces app to save full resolution photos from the roll to the web and have that linked to push to flickr. You could also use the native flickr app to pick them from the roll.