How a safe migration is sequenced
A migration is risky when it is treated as a copy job. It is safer as a sequence. We begin with an audit: how many records, how many are duplicates, which mandatory fields are blank, which relationships (contact to company, deal to contact) are intact. That audit decides what to clean, what to archive and what to leave behind. Not every old record deserves a place in the new system.
Next comes mapping. Source fields rarely match target fields one to one. A free-text field may need splitting, a status list may need collapsing, and two old pipelines may become one. We document each decision in a mapping sheet you can read without technical help.
We then run a trial load into a test environment, you inspect it, we correct, and we load again. Only then does production load happen, normally over a weekend or a quiet period, with the old system frozen to new edits. Most migrations take 3 to 8 weeks; a large estate with several source systems takes longer, and the audit tells us how much longer.
