how to minimize storage

I have 300 circa bibliographic citations in my library, without pdf attached, just the citations. And if I look at my profile it shows that I am using 57% of my free sorage on zotero server (100 MB). Isn't it too much for 300 references?
I have unchecked the option to sync attachments.
Also, looking at my "storage" folder in the zotero folder in the home directory of my computer, I find 300 items each taking up between 600 k and 1.7 MB, isn't this too much for a reference?
  • I am not entirely sure I follow. Unchecking the sync attachments button does not purge your storage. You can sync an unlimited number of references, so you have no worry there, the only thing that is limited is attached files.

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