Cache folders taking a lot of space: store_00010001/Pictures/cache/com.google.android.googlephotos/picasa--{0,1,2...} I've found that this cache folders take 1,5GiB of my 16GB Nexus 5:
store_00010001/Pictures/cache/com.google.android.googlephotos/picasa--{0,1,2...}

Is it cache of some app, which I can easily remove from phone level? (App settings -> clear data/cache?)
Or do I have to clear it from computer periodically?
solution: block with empty file

block folder creation with an empty file

on my phone i created this empty file

/storage/emulated/0/Pictures/cache


size

that folder was 7 g on my phone

https://plus.google.com/photos/yourphotos say "3306 photos"

recreated daily

if i deleted the folder, it reappeared the next day

side effect

no side effects noticed by using this solution

auto backup still works

system

tested on my nexus 5