Self-hosting
With self-hosting the software runs on the company's own or rented server, so the data stays under the company's control.
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Explanation
It is chosen when data must stay in-house for regulatory or internal reasons. Updates, backups and monitoring then fall to the company (or someone it hires).
What matters is whether the self-hosted version does the same as the cloud one.
How HelloTeam does it
HelloTeam's self-hosted plan is the same system on your server, quoted per installation.