How many snapshots can I take per Confluence page?

There is a limit of 50 snapshots that you can take per Confluence page.

Where are the snapshots stored?

All static snapshots are stored together with your Confluence pages, i.e. your data is managed and stored by Atlassian. SoftComply only gathers the data, encrypts and zips it, and stores it with your Confluence page itself. SoftComply does not store your data anywhere outside Confluence.

On topics regarding Jira and Confluence, please see Atlassian Community forums