By Darren Murph posted May 19th 2010 9:00AM

Whoa there, vaquero — don’t get too excited just yet. As with just about every other gratis backup service on the web, there’s a catch you should know about with mSpot‘s latest endeavor. The free limit is right around 2GB (exact size is TBD), so if you’ve got more than a second generation iPod’s worth of audio, this here service will only serve as a tease. For those who fall under that threshold, there’s plenty to love, and if you’re down for ponying up, you’ll be able to secure 10GB for $2.99 per month or 20GB for $4.99 per month. Launched today at Google I/O, this “freemium” music cloud service essentially syncs your entire music library (either in iTunes or a user-designated arrangement of folders) with mSpot’s servers — provided your library is less than 20GB, of course — and then makes it available anywhere. Phones and other computers should have no issue tapping in (though only Android will be supported out of the gate), and the app itself runs quietly in the background in order to check for new additions / subtractions and mirror said changes in your online library. For now, the service is available by invitation only through, with public availability slated for next month. Size limits aside, the service worked well for us in our limited testing, though that first 20GB upload is a real pain over Time Warner Cable’s obviously capped Road Runner internet. Oh, and if you’re bummed about not being guaranteed an invite today, you shouldn’t be. Hit that source link and enter “engadget” as the password — the first 500 get immediate access, but once they’re gone, they’re gone.

*20GB tops, buster!
**Only on Android, Macs and PCs at first, chief!