Can I backup a client running version X to a server running version Y?

This Wiki is brought to you by Backup Central, where you can find the Mr. Backup Blog, Forums, and a mailing list for each forum!
Backup FAQs	Service Providers	Backup Software	Backup Hardware	Backup Book Wiki	Free Stuff	Miscellaneous

There are exceptions to this rule, but the general recommendation (and supported method) is to always have the server at a higher level than the clients. Your mileage will vary, and your support will probably disappear, if you have a client at a higher version than the server.