Can my employer access my iCloud data if I sync it on my managed Mac I have an iCloud Drive with all my files on it and also all my Safari bookmarks are synced to iCloud. Also most importantly my 1Password data is in iCloud.
My new employer is forcing me to use a company MacBook which is a 'managed Mac' meaning everything is controlled by the employer.
What should I do, just sign into my personal iCloud account and hope for the best or do you think my employer could access all this data?
With a managed Mac where &quot;everything is controlled by the employer&quot;, the employer could technically access your personal data stored on that Mac - yes. It doesn't matter if the data comes from iCloud or other places.
Note that your employer probably does not access your personal data, and depending on where you live and what you agreements are, it is probably not legal for them to do so. However, it is very probable that they could access the data given the necessary intent and technical knowledge.
My advice would be not to store any personal data on a company laptop, unless you wouldn't mind your employer or a system administration to stumble upon that data.