I use Dropbox to sync company files, backup data, have access to personal data between computers, iphone, ipad or other computers via the web.
It has saved me on more than one occasion with access to ID/Passport scans, health insurance cards, bank account/wire info, etc that I can email from my phone and not have to rush home to get.
It's also great to quickly share sales docs between sales reps or promo tools to clients for my mainstream biz.
I'm still on the free version. I've referred enough people to keep getting bumped up. With every referral they give another 250MB of storage for free;-)
If you want to check it out, and get me another FREE 250MB storage - signup here:
http://db.tt/z38aViH