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Once your CrashPlan account is provisioned, yes. After you sign up for the service, you'll receive an email confirming your account. At that point, you'll be able to install the client software using these instructions. Of course, if you're at all unsure, especially with regard to selecting which files to back up, your Computing Consultant can assist you as well.
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Full-version upgrades of the CrashPlan software in current versions of macOS (from version x.y to y.z) require re-authorization of the 'Full Disk Access' permission for the software. Follow the instructions in "macOS: Grant CrashPlan Full Disk Access"