There are sometimes gotchas in moving a site to a remote server, but once they're solved, you're in business and the solutions are usually simple.
With the new Media Sources, using disk files is no problem (though, again, it can be somewhat tricky to set up, especially if you intend to restrict access to certain resource, files, or elements in the MODX Manager).
You can also use NewsPublisher or one of the other front-end editing solutions to keep lower-level users out of the Manager.
Once you have things set up, though, transferring the files is definitely all you'll need to do.
Welcome back.
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PLEASE, PLEASE specify the version of MODX you are using . . . PLEASE!
MODx info for everyone:
http://bobsguides.com/modx.html