Hourly backups don't cut it for me. The crash can come unexpectedly and at any time. Losing up to 59 minutes of work doesn't seem like a good solution. These days if I enter a contact on my phone, I expect to be able to find it on my computer almost instantaneously. Apple are working towards that kind of instant access with push notification etc, so 59 minutes is way too much to lose.
For anyone stumbling on this problem, ForeverSave LT is free and does the job, autosaves every minute, and helpfully (for my preference) reminds me to save soon after starting a document. Sadly if you are researching this it is probably too late.
It's still not a perfect solution though, as I don't want to lose previous saves that might be important if I make a mistake that I can't undo, or make a delayed decision to revert to a previous version (style change or something).
The best scenario would be to autosave regularly to myfile[autosave].pages, and leave myfile.pages alone creating a backup of the original file, as backup is good. Seems this could only be achieved simply by using *shudder* ms word (or basically every other word processor on the market).
I won't though, I will tolerate this like I tolerate many things in exchange for a nice interface and decent picture handling.
The new version of my document is actually probably a bit better having had a practice run at it, maybe Apple can start advertising the lack of autosave as a feature? benchmarks show documents written in Pages are 30% better and 80% faster than in other word processors (small print: the 2nd time).