Idea blade is coming with a ROM of 256 MB and user space will be nearly 60 MB. Once you start installing applications or updating it free memory will be decreased. Here are some useful ideas to free up your ROM.
Many pre-installed applications get updates via Google Play. Once you update these applications it is not ORIGINALLY updating the app but installing a newer version which in turn eat your internal memory. That is why when yo reset your system, your applications are able to return to original version.
There is an application called Apps2Rom is available to download. It helps to check if your device has duplicated applications. i.e., original application in ROM and its updated version. Your phone should be rooted to use this application. Once you open this app, you can see the list of applications in it. If any application is duplicated, (this can be identified by looking into the dot near the application. If you see two green dots near any application it means it is duplicated) you can replace your old version with latest one. By doing is you are uninstalling factory installed application and installing a fresher version. Further updates to this version will not create any duplicates.
Also, if your phone is rooted, you can try uninstalling your factory installed applications such as games, facebook,twitter,youtube,opera mini etc. This can save a lot of space. Many applications such as Root Uninstall and Root uninstaller etc, are available in Google Play for download. Try these.
These techniques are not limited to Idea Blade and can be tried in all supported Android devices.