Yesterday morning a small wellness clinic moved its entire business onto a new platform. New website, new booking system, real card payments switched on. The whole changeover took about five minutes, and no customer saw a thing.
The old platform is still running. It is still being paid for. It will be for another thirty days.
That is the part nobody does, and it is the part that makes switching business software safe instead of terrifying.
Why keep paying for software you just replaced?
Because you do not actually know the new thing works until real people use it.
Testing is not the same as living with something. We tested that clinic's booking system twice, end to end, from a real phone. Both times we found problems. The second test found a fault the first test had created. And even after all that, the first day on the real address turned up one more: a link to an old blog post that worked in one form and broke in another, because a single letter was capitalised differently.
That is the kind of thing you find on day one of real traffic, not on day zero of testing. If the old system is already cancelled when you find it, you have no way back. If it is still sitting there, quietly running, you do.
The overlap is not indecision. It is the cost of being able to change your mind.
What the old system is actually for during the overlap
Three things, and only three.
- A way back. If something is badly wrong, you point the address at the old system and you are trading again in minutes.
- A record. Your customer list, your booking history, your invoices — export them to a file on your own computer before you cancel, not after.
- A comparison. You can check what the old thing did against what the new thing does, while both are in front of you.
Here is the discipline that makes it work: the old system stays alive but goes quiet. For the clinic, that meant hiding the four bookable services on the old platform so nobody could accidentally book there, while leaving the site and the subscription untouched. Two doors, only one of them open.
The list that saved us
Weeks before the move, we did something dull. We went through the old website and wrote down every single page address it had ever served. Twenty-eight of them.
On changeover morning, twenty-seven worked immediately on the new site. One did not. It was a blog post whose link existed in two slightly different spellings, and only one of them had been carried across. We found it in the first sweep, fixed it, and got to twenty-eight out of twenty-eight.
Nobody would have reported that broken link. Someone would have clicked it, got an error page, and quietly left.
Write down what you have before you replace it. Every page, every phone number, every form, every place your business name appears. You cannot check that a move went cleanly if you never wrote down what "clean" looks like.
Three things that are easy to forget on moving day
These are the ones that bite small businesses, because they live outside the thing you are actually replacing.
Anything a third party has on file
The clinic's text-message provider had three specific page addresses registered — a privacy page, a terms page, a contact page. Those pages existed on the old site and nowhere else. The moment the address moved, they would have returned an error, and text messages to customers would have started failing. Not on day one. Quietly, later.
We ported all three across before we changed anything. Nobody was going to notice that gap until the texts stopped.
Your phone numbers
Two personal mobile numbers were still printed across the old site. They came off and business lines went on — every page, checked one by one. When you grow past doing everything yourself, your own mobile number stops being a convenience and starts being a liability.
Your legal name
The clinic's footer named a company that does not exist. It had been there since the site was built, before the trading structure was settled. It went on nineteen pages and stayed there for weeks. Nobody had looked.
The takeaway
Set a date to cancel the old system, put it a month after the move, and do not touch it until then — the thirty days of double billing is the cheapest insurance your business will ever buy.
If you are about to move a booking system, a website, or a payments setup, the order matters more than the speed: write down everything you have, build the replacement beside it, prove it with real use, then switch — and only cancel once a month of ordinary business has gone through without a single surprise.