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hi. on my rpi2 when i delete a file(on sd card) with "rm <filename>" the file is deleted but when i run "df" the available storage remains the same. any thoughts?

This file you deleted is still available in snapshots

where can i check how often snapshots are created? can i create a snapshot from terminal?

Please look here

If you run your Pi 24/7, one per day, one per week and before you're installing/removing packages with apt-get.