PC and tablet maker Acer , earlier today disclosed a cloud service for its devices at CES 2012. Dubbed as AcerCloud, it’ll permit easy sharing of photos and documents on Acer devices but in a limited amount.

Unlike Apple’s iCloud, which has been designed to sync media in the background, AcerCloud is set up to allow automatic sharing of photos and documents but is limited to 30 days. Those files are ultimately backed up forever on your PC not in the cloud.

It works like this: You take some photos with your smartphone, and AcerCloud automatically puts them in on a service called PicStream, which can then push the photos back to an Acer PC or some other device. This service currently works for Android phones only though Acer says support for Windows Phone is on the way.

Similarly, saving documents to AcerCloud permits users to access them from anywhere, but only for 30 days. And Acer’s clear.fi application enables users to stream or download music/videos anytime from the cloud but there is no 30-day limitation on clear.fi.

Acer says users can use their phone to extract the files from the “main PC” anytime via AcerCloud, even if the system is in sleep mode. This service will use both local and cloud storage together so data will be available every time.

The service by Acer, offers many of the same features of similar other cloud services like Eye-Fi and iCloud though its 30-day expiry for storing documents and images seems to be a serious limitation.