Questions about cloud accounting

Usually yes. In Money Magician you invite your accountant, who can then review the books and use the P&L, Balance Sheet and tax-ready exports.

Any bank, if the software accepts CSV or CAMT.053 statements. Money Magician supports both, plus a direct Wise sync.

Yes. Money Magician keeps each currency's balance separately, and you can switch on a merged view in your base currency when you want one total.

That depends on the provider. Money Magician backs up its database automatically and copies uploaded documents every night to an encrypted, read-only offsite archive in the EU.

You should use it. Your books give access to bank data and client details; Money Magician offers optional two-factor authentication.

It depends on the country: seven years in the Netherlands, and comparable or longer periods elsewhere. Make sure you can export everything before you ever switch.