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Amazon Cloud Drive storage swells

Just a day after the music-streaming service Spotify launched in the U.S., Amazon announced its plans for a new feature on its own cloud storage service — unlimited storage, for a brief bit, on Cloud Drive.

The offer applies to Amazon Cloud Drive customers who've signed up for a Cloud Drive plan or been eligible for a 20GB upgrade. From now until their current plan expires, they'll have unlimited storage for .mp3 and .mp4 files, and they can now put everything they own on the Cloud.

Well, almost everything. Files that will be stored under the "Unlimited" banner will include most song files bought from digital music stores, and uploaded from music CDs. Non-song .mp3 files won't qualify, and you'll need to buy storage for that. 

Until now, Cloud Drive gave you 5 GB of storage when you sign up, and 20 GB when you bought your first album. And tiered plans exist for all the space you need after that. 

You probably won't need those details now, but you may want to keep them in mind for later — if you plan to renew your plan with Cloud Drive after this unlimited-for-now offer has dried up. 

More about music on the cloud from msnbc.com: 

Nidhi Subbaraman writes about tech and science at msnbc.com. Find her on Twitter and Google+ and join our conversation on Facebook.