If you're looking to keep a copy of your contacts safely you might want to check out; http://www.sootech.mobi
"Here's the benefit list they have:
SHARE and Save Contacts
- Get updated contact information from all your contacts (who use sootech.mobi)...even if they change numbers
- Don't lose your contacts again (even if you break, lost, or stolen your mobile phone)
- Access ALL your contacts on your new Phone!
Make Networking SIMPLE:
- Share contacts EASILY (great for networking and friends)
- Get rid of useless stacks of business Card (easily get access and save your client's Contact's in FULL)
- Share your Contacts easier (make it simple for people to add you)
- PROTECT YOUR PRIVACY/CONTACTS: Share Contact info online without Evading eyes of Others (simply use your Unique Sootech ID)"
Hopefully with this you can have the flexibility of using any OS you want. Right now the app for iOS is launching out in a couple days.
Also any new contacts can be save and sync immediately so you don't need to wait till you get to your computer for your contacts to be saved.